Các bạn có thể tải toàn bộ: Đề và đáp án vòng 1 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Exam 1: Sắp xếp


Exam 2: Đi tìm kho báu

Each of cars can take 8 people. How many cars needed to take 124 people? Answer: 16


How do you write this number (735) using word? Answer: Seven hundred and thirty - five

How many integer numbers between 200 and 300 are there for which the hundreds digit equals the sum of the other two digits? Answer: 3

Spoiler:

Jim has 20 apples and oranges. The number of apples is 4 times the number of oranges. How many apples does Jim have? Answer: 16

If subtractin 19 from the greatest 2 - digit number and then dividing the difference by 4, we get the result… Answer: 20

Jim is 12cm taller than John. John is 139cm tall. Bob is 21cm chorter than Jim. How tall is Bob? Answer: 130

The time is 7:30am. What time will it be after 2 hours 30 minutes? Answer: 10am

The perimeter of a square is 80cm. What is the measure of each side? Answer: 20

The quotient of two number is 1 and their product is 100. Find the sum of the two numbers? Answer: 20

The sum of two numbers is 20 and their difference is 0. What are the two numbers? Answer: 10 and 10

There are 38 students in the class 5A. The students can be sit at the 11 tables with no empty seats. There are small table for 3 students and large table for 4 students. How many small table and apples large table in the class? Answer: 6 and 5

Tom has 1/3 pizza left in the fridge. He eats 1/4 it for his breakfast. What fraction of the orginal pizza does he have left for lunch? Answer: 1/4

What is the perimeter of rectangle with sides 5cm by 4cm? Answer: 18

Exam 3: Sắp xếp


Sắp xếp theo thứ tự bên dưới (từ trái qua phải, từ trên xuống dưới):

Các bạn có thể tải toàn bộ: Đề và đáp án vòng 2 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Exam 1: Sắp xếp


Sắp xếp theo thứ tự bên dưới (từ trái qua phải, từ trên xuống dưới):

Ghi chú:

Exam 2: Đi tìm kho báu

A book has 250 pages starting at number 1. How many digits are there in the page numbers of the book? Answer: 642

Bài giải chi tiết:

A group plants 912 pine trees every 3 days on average. How many pine trees can that group plants in 5 days? Answer: 1520

Anna is 5 years older than Peter. Peter is 3 years older than Melvin. The sum of their ages is 32. How old is Peter? Answer: 10

Bài giải chi tiết:

Calculate: 1/(2x3) + 1/(3x4) + 1/(4x5) + … +1/(38x39) + 1/(39x40) =… (Write your answer by decimal in the simplest form). Answer: 0.475

Bài giải chi tiết:

Calculate: 2/5 - 1/10 =... (Write your answer by fraction in the simplest form). Answer: 3/10


Calculate: (1 + 5/8) : 1/4 = ... (Write your answer by fraction in the simplest form). Answer: 13/2


Calculate: (5 + 2/7) x (1 + 3/4). (Write your answer by decimal in the simplest form). Answer: 9.25


Calculate: 9 + 2/9 + 5 + 7/9 = ... Answer: 15


Compute: 1 + 3 + 5 + … + 199 = … Answer: 10000

Convert: 25mm² = ... cm². (Write your answer by decimal in the simplest form). Answer: 0.25

Find A, if A is 3 less than the average of 48; 55; 29 and A. The value of A is… Answer: 40

Bài giải chi tiết:

Find B, if B is 34 more than the average of 35; 40; 56 and B. The value of B is… Answer: 89

Bài giải chi tiết:

Look at this sequence: 2; 6; 12; 20; ... What number should come next? Answer: 30

Bài giải chi tiết:

The average of 35, 40, 41, m and 50 is 45. Find the value of m? Answer: 59

Bài giải chi tiết:

The average of A, B and C is 48 and A is 8 less than the sum of B and C. The value of A is… Answer: 68

Bài giải chi tiết:

The average of all 2 - digit natural number which are divisible by 2 is… Answer: 54

Bài giải chi tiết:

The average of two numbers is 92 and their difference is 6. What is the value of the smaller number? Answer: 89

Bài giải chi tiết:

The product of two numbers is 2364. The product of double the first number and triple the second number is… Answer: 14184

Bài giải chi tiết:

The ratio of two numbers is 2 : 4 and their sum is 270. The greater number is… Answer: 180

Bài giải chi tiết:

The sum of denominator and numerator of a fraction is 121 and the fraction is equal to 4/7. Find the denominator of the fraction? Answer: 77

Bài giải chi tiết:

The sum of four consecutive natural numbers is 1962. The greatest number is... Answer: 492

Bài giải chi tiết:

The sum of the smallest 3 - digit number and 241 is… Answer: 341

The sum of two consecutive odd numbers is 248. The smaller number is… Answer: 123

Bài giải chi tiết:

The sum of two numbers is equal to 77. If the first number is multiplied by 8 and the second by 6, the two product are equal. The larger of these numbers is… Answer: 44

Bài giải chi tiết:

The sum of two numbers is the greatest 3 - digit number and their differnce is the greatest 2 - digit number. The greater number is... Answer: 549

Bài giải chi tiết:

There are seven squares in the picture. How many triangles than squares are there in the picture? Answer: 3

Bài giải chi tiết:

Which is the greatest 2 - digit number divisible by 2, 3 and 4? Answer: 96

Write >; =; <: 13/15 ... 4/5. Answer: >


Write >; =; <: 26/13 ... 6/3. Answer: =


Exam 3: Cóc vàng tài ba

Calculate: (1 + 2/5) x 6/7. Answer: 6/5 


Calculate: 6 + 2/9 = ... Answer: 56/9


Calculate: 7 + 3/5 = ... Answer: 38/5


Convert: 1/16 m² = ...cm². Answer: 625


Convert: (3 + 1/25)kg = ...g. Answer: 3040


Find the greatest fraction: 1/3; 2/4; 1/4; 3/15? Answer: 2/4


Find the whole number A, knowing that A is 18 units greater than the average of A, 29 and 45. The value of A is… Answer: 64

Bài giải chi tiết:

Give the number sequence: 1, 4, 7, 10, 13, … Find the 15th term of the number sequence. Answer: 43

Bài giải chi tiết:

How many 3 - digit even numbers? Answer: 450

Bài giải chi tiết:

How many natural numbers are not greater than 2016? Answer: 2017

Bài giải chi tiết:

If 2a456b is divisible by 2; 3; 5 and 9 then a + b = ... Answer: 1

Bài giải chi tiết:

In the class there are 24 children, 10 children have a sister and 16 children have a brother. Mai, Lan and Trang have no brother and no sister. How many children in that class have both a brother and sister? Answer: 5

Bài giải chi tiết:

Miken bought 17 pens and he had to pay $51. How much do 30 pens of the same kind cost? Answer: $90

Mary is 8 years old. Her father is five times as old as Mary. How old is her father? Answer: 40

Bài giải chi tiết:

The average of five numbers is 20. The average of the five number is 18 when one of the numbers is chaned to 4. What is the orginal value of the changed number? Answer: 14

The difference of two numbers is 157. Their ratio is 3/2. Find the greater number. Answer: 471

The greatest 4 - digit number that divisible by 15 is... Answer: 9990

Bài giải chi tiết:

The last digit of the product 1 x 5 x 7 x 9 x 11 x … x 99 is… Answer: 5

Bài giải chi tiết:

The least natural number is… Answer: 0

The primeter of a rectanglar is 400m. The width is 3/5 the length. What is its area in meter square rectanglar?… Answer: 9375

Bài giải chi tiết:

The ratio of two numbers is 3 : 7 and their sum is the smallest 3 - digit number. Their difference is... Answer: 40

The ratio of two numbers is 4 : 5 and their sum is 135. Find the smaller number. Answer: 60

The sum of even numbers from 16 to 56 is… Answer: 756

The sum of odd numbers from 34 to 135 is… Answer: 4335

The sum of the digits of a ten - digit number is equal to 9. What is the product of the digits of this number? Answer: 0

The sum of two fraction is 13/15 and their difference is 1/5. What is the value of the larger fraction? Answer: 8/15

Bài giải chi tiết:

The sum of two numbers is 359 and there are 54 even numbers between them. The greater number is… Answer: 234

Bài giải chi tiết:

What is 3/26 of 494? Answer: 57


When x is divided by 49, the quotient is the greatest 1 - digit number and the remainder is the greatest possible number. The value of x is… Answer: 489

Chú ý:

Các bạn có thể tải toàn bộ: Đề và đáp án vòng 3 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Exam 1: Sắp xếp


Sắp xếp theo thứ tự bên dưới (từ trái qua phải, từ trên xuống dưới):


Exam 2: Đi tìm kho báu

6 people complete a task in 3 days. How many people are needed to complete the same task in 2 days? Answer: 9

Giải:

A truck can only carry 20 packages of rice. Each package contains 50kg of rice. If the truck carries with 80kg - package, how many packages can the truck carry at most? Answer: 12

Giải:

Calculate: 5 2/7 x 1 3/4 = … (Write your answer as a decimal in the simplest form). Answer: 9.25


Calculate: 6 1/6 + 1 5/6 = … Answer: 8


Calculate: 20/16 + 3/15 + 2/12 + 3/4 + 4/5 + 5/6 = … Answer: 4


Calculate: A = 1 1/10 + 2 2/10 + … + 9 9/10 = … (Write your answer as a decimal in the simplest form). Answer: 49.5


Calculate: A = 9/4x5 + 9/5x6 + … + 9/34x35 + 9/35x36. Answer: 2

Giải:

Hoa bought 2 dozens of table tennis balls and she had to pay $48. Lan buys 8 of the same ones, then how much does Lan have to pay to seller? Answer: 16

Giải:

How many digits 1 do you need to write down all the numbers from 1 to 100? Answer: 21

Giải:

How many distinct 2 - digit number are there? Answer: 81

Giải:

How many distinct 2 - digit numbers from 10 to 69? Answer: 54

Giải:

How many odd numbers from 10 to 60? Answer: 25

Giải:

Look at this sequence: 2; 11; 36; 85; … What number should come next? Answer: 166

Giải:

Mark had 45 books at fisrt. He gave 1/5 of his books to his best friend. Then he gave 1/3 of the remaining books to his brother. How many books does he have now? Answer: 24

Giải:

On the left side of Vine Street, all of house are numbered by the odd numbers from 23 to 105. On the right side, all of house are numbered by the even numbers from 24 to 108. How many house are there on the Vine Street? Answer: 85

Giải:

The average of two number is 234 and their difference is 106. What is the value of the smaller number? Answer: 181

Giải:

The cost of 2 kilograms of oranges is 14 dollar. What is the cost of 12 kilograms of oranges? Answer: 84

Giải:

The cost of 5 pencils is 9 dollar. How much does Mrs. Emily have to pay for 10 pencils? Answer: 18

Giải:

The denominator of the fraction 45/54 is… Answer: 54


The last digit of the product: 1 x 2 x 3 x 4 x … x 11 is … Answer: 0

Giải:

The least common denominator of two fractions 2/21 and 3/28 is… Answer: 84

Giải:

The ratio of two numbers is 1:5 and their sum is 174. The greater number is… Answer: 145

Giải:

The sum of five consecutive natural numbers is 4215. The smallest number is… Answer: 841

Giải:

The sum of two denominator and numerator of a fraction is 95 and the fraction is equal to 2/3. Find the numerator of the fraction? Answer: 38

Giải:

The sum of two consecutive even numbers is 850. The smaller number is… Answer: 424

Giải:

The value of digit 5 in 345261 is… Answer: 5000

There are 35 blue, 42 yellow and 27 black marbles in a box. Jack closes his eyes and draws a marble from the bos. At least how many marbles must Jack draw to ensure that there are 1 blue marble? Answer: 70

Giải:

Tom is 9 years old and his mother is 35 years old. In how many year’s time will his mother’s age be three times Tom’s age? Answer: 4

Giải:

Two books and three pens cost $35. Two books and six pens cost $50. How much does each pen cost? Answer: 5

Giải:

What is the remainder when 1 + 11 + 111 + … + 1111111111 is divided by 9? Answer: 1

Giải:

Exam 3: Cóc vàng tài ba


A book uses 1164 digits for numbering its page numbers. How many pages does the book have? (The book starting at number 1). Answer: 424

Giải:

A box contains some balls, the ratio between red balls and blue balls is 2 : 3 and the ratio between blue balls and yellow balls is 6 : 1. What is the ratio between red balls and yellow balls? Answer: 4 : 1

Giải:

Giải:

Calculate: 1 + (1 + 2)/2 + (1 + 2 + 3)/3 + … + (1 + 2 + 3 + … + 199)/199 = ... Answer: 10049.5

Giải:

Convert the mixed number 5 7/9 to a fraction. Answer: 52/9


Each letter stands for a difference digit (0, 1, 2, …, 9) and p + 1/(q + 1/r) = 35/9. Which of the following value is equal to p x q x r? Answer: 24

Giải:

Find the average of 82/4 and 146/4. Answer: 57/2


Find x, if x : 3 + 1 – 2 + 3 – 4 + 5 – 6 + … + 97 – 98 + 99 = 127. Answer: 231

Giải:

Given 4 fractions: 2/3; 5/6; 3030/9090; 59/60. The largest fraction is... Answer: 59/60


Given the number sequence 4; 7; 10; 13; … Find the 15th tern of the number sequence. Answer: 46

Giải:

How many even numbers from 210 to 713? Answer: 252

If 4/5 : x = 1 4/5 then x = ... Answer: 4/9


If 123m is divisible by 8, find the possible value of m. Answer: 2


In the following number, which number is divisible by 6? Answer: 2016

Giải:

Look at the following series: 3/4; 5/6; 21/20; 8/7; 34/35; 56/49. How many fractions are greater than 1 are there in the series? Answer: 3

Giải:

Mike has $50. He intends to buy 5 exercise books, each book costs $5 and some pencils, each pencil costs $3. How many pencils can he buy at most? Answer: 8

Giải:

Several different numbers are written on the board. Exactly two them are divisible by 3 and exactly 9 of them are divisible by 13. Let M be the greatest of these numbers. What is the smallest possible value of M? Answer: 130

Giải:

The difference of denominator and numerator of the fraction 145/941 is... Answer: 796

Giải:

The difference of two numbers is 189. Their ratio is 2/5. Find those two numbers. Answer: 126; 315

Giải:

The product of 4/3 and 5/6 is… Answer: 10/9

Giải:

The sum of two denominator and numeratorof the fraction 243/167 is … Answer: 410

Giải:

The sum of two numbers is 156. The first number is 5/7 the second number. What is the value of the smaller number? Answer: 65

Giải:

There are 30 balls in box, 1/3 of them are red, 3/15 of them are blue, the rest are yellow. How many yellow balls are there in the box? Answer: 14

Giải:

There are 56 apples in box A and 64 apples in box B. How many apples must be transferred from box B to box A so that the number of apples in box A 3 times the number of apples in box B? Answer: 34

Giải:

Which of the follwing fraction is equal to 36/162? Answer: 12/54

Giải:

Write all 4 - digit numbers from the smallest to the greatest. What is the 241th 4 - digit number? Answer: 1240

Giải:

Write these fractions: 1/5; 2/1; 3/2; 4/3; 5/4 in order from the greatest to the least. Answer: 2/1; 3/2; 4/3; 5/4; 1/5

Các bạn có thể tải toàn bộ: Đề và đáp án vòng 4 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Exam 1: Sắp xếp


Sắp xếp theo thứ tự bên dưới (từ trái qua phải, từ trên xuống dưới):


Exam 2: Đi tìm kho báu

3m 30cm = … dm. Answer: 33

5 3/4kg  = … g. Answer: 5750


25g = …kg. Answer: 1/40


32cm = … km. Answer: 1/3125


13 sacks of ticky rice and 17 sacks of ordinary rice weigh 750kg. The weight of each sack is the same. How many kilograms are there in each sack? Answer: 25

Giải:

A 144m of fabric was cut into segments, each segment is 9m long. How many segments are there? Answer: 16

Giải:

A famer harvested 1 tone of tomatoes in the fisrt field. In the second field, he harvested amount of tomatoes that is 2 times as weight as the fisrt field. How many kilograms of tomatoes did he harvest in 2 field? Answer: 3000

Giải:

Calculate: 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 =...  Answer: 127/128

Giải:

Calculate: 1m² + 1/20 m²  = … hm. Answer: 10500cm²


Calculate: 40dm x 25 = … hm. Answer: 1

Cindy is 10 years old. One day, she asked about the age of her teacher. “I will be 58 years old by the time you are as old as me now”, her teacher replied. How old is her teacher? Answer: 34

Giải:

Convert: 1m² = … dam². Answer: 1/100


Convert: 3m² 25dm² = … m². Answer: 3 1/4


Convert: 8kg 6g = … g. Answer: 8006

Convert: 26dam² 19m² = … m². Answer: 2619

Find x such that: (1 + 1/2) x (1 + 1/3) x (1 + 1/4) x ... x (1 + 1/x) = 1008 1/2. Answer: x = 2016

Giải:

 
Find x such that: x + 7/14 = 6 1/2. Answer: x = 6


Five students do an exam. The scores of four students are 41, 44, 46 and 49. The average score of five students is the same as the score of the fifth student. Find the score of the fifth student? Answer: 45

Giải:

Given fraction 29/47. If both its denominator and its numerator are decreased by X units then the new fraction will equal to 9/15. Find the value of X? Answer: 2

Giải:

How many triangle are there in the figure? Answer: 12

Giải:

The area of a field is 1ha/10. Knowing that, a famer obtains 50kg of rice in each 100m². How many kilograms of rice does the famer obtain in this field? Answer: 500

Giải:

The distance between A and B is 37m in fact. How long is the distance on a map with a scale of 1 : 500? Answer: 74mm

Giải:

The sum of numerator and denominator of a fraction is 100. The ratio of numerator and denominator is 2 : 3 after 23 is added to the numerator and 32 is added to the denominator. Find the fraction? Answer: 39/61

Giải:

The sum of two consecutive odd numbers is 3712. Find the larger number? Answer: 1857

Giải:

There are 4 Thurdays and 5 Wednesdays in May. On which day of the week was 15th of May in that year? Answer: Monday

Giải:

There are 61 trees at regular intervals from beginning of the road to the end of it. The distance between every two consecutive trees in 3m. How long is the road? Answer: 180m

Giải:

To tile yard of school, they use 10800 square tiles with 50cm side length. What is the area of the yard? (The area of mortar joints is negligible). Answer: 2700m²

Giải:

What is the difference between the greatest and the smallest 4 - digit number that each formed by different digits? Answer: 8853

Giải:

What are the number in the 35th group in the pattern below? (1,5,10) (2,10,15) (3,15,20) … Answer: 35,175,180

Giải:

Bài thi số 3: Điền kết quả thích hợp vào chỗ (...):

Fill in the blank with the suitable sign (>; =;<)

Câu 2:
Comapre: 1/5 tonne < 250kg

Câu 1:
Compare: 2kg 100g = 2100g

Câu 2:
Compare: 4dm² 7cm² > 47cm²  

Fill in the blank with the suitable number

Câu 2:
7/5 of 8cm² is 1120 mm²

Câu 9:
A 6-digit number begins with the digit 8. The number is divisible by 9 and all digits of the number are different. What is the possible smallest value of this number?
Answer: 801234

Câu 7:
A car consumes 12l of gasoline every 100km. How many liters of gasoline does the car consume if it travels a distance of 250km?
Answer: 30 liters.

Giải:

Câu 5:
A tank contained 414l of honey,  of this amount was taken away. How many liters of honey are left?
Answer: 276 liters.

Giải:

Câu 9:
Amanda's average mark for the first four tests was 88. How many marks did she score for the fifth test to improve her average mark to 90?
Answer: 98

Giải:

Câu 6:
An elephant weighs 5 tonnes, A horse weighs 250kg. How many times is the elephant as weight as the horse?
Answer: 20 times.

Giải:

Câu 10:
Calculate: 1 1/2 + 2 1/6 + 3 1/12 + 4 1/20 + 5 1/30 + 6 1/42 + 7 1/56 + 8 1/72 + 9 1/90 + 1/10 = 46

Giải:

 
Câu 4:
Calculate: 4m 40cm + 3m 20cm = 760 cm

Câu 4:
Calculate: 8m 27dm - 2m 4cm = 866 cm

Câu 9:
Calculate: 2016 - 2013 + 2010 - 2007 + 2004 - ... - 9 + 6 -3 = 1008

Giải:

Câu 3:
Convert: 1ha =  1 hm²  

Câu 3:
Convert: 2hm 4dam = 240 m

Câu 4:
Convert: 2kg 16g = 2016 g
Câu 3:
Convert: 10000dm = 1 km

Câu 5:
Fill the suitable number in the following blank.
4cm²25mm² = 425 mm²

Câu 5:
Find the value of a such that 2/3 < a/9 < 5/6.
Answer: 7

Giải:

Câu 7:
Find the value of x such that 216m/x = 2400cm.
Answer: 9

Giải:

Câu 9:
Find X such that Xkm² + 42dm²3m2 = 7004203m².
Answer: X= 7

Câu 9:
Given fraction 79/184. If both its denominator and its numerator are increased by M units then the new fraction will equal to 112/252. The value of M is 5

Giải:

Câu 9:
Look at this sequence: 0; 2; 4; 6; 12; 22;  
What number should come next?
Answer: 40

Giải:

Câu 10:
The average mass of a group of children is 47kg. If   of the number of children are girls and their average mass is 39kg. Find the average mass of the boys.
Answer: The average mass of the boys is 52 kg

Giải:

Câu 8:
The first box contains 350kg of strawberries. The second box contains 50kg of strawberries more than the first one does. How many kilograms of strawberries do the two boxes contain?
Answer: The two boxes contain 750 kilograms of strawberries.

Giải:

Câu 8:
The area of the floor is 27m². To tile a floor, they used some square tiles with 20cm side length. How many tiles are needed to cover the whole floor?
(The area of mortar joints is negligible)
Answer: 675 tiles.

Giải:

Câu 9:
The sum of A and B is 598. The sum of B and C is 374. The sum of C and D is 300. Find the sum of A and D.
Answer: The sum of A and D is 524

Giải:

Câu 5:
There are 9 boxes of apples. Each box contains 35kg. If we take away 172kg from these boxes, how many kilograms of apples are left?
Answer: 143 kilograms.

Giải:

Câu 8:
There are 72 kilograms of rice divided equally into three bags. How many kilograms of rice does each bag contain?
Answer: 24 kilograms.

Giải:

Các bạn có thể tải toàn bộ: Đề và đáp án vòng 5 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Bài thi số 1: Sắp xếp


Sắp xếp theo thứ tự bên dưới (từ trái qua phải, từ trên xuống dưới):


Bài thi số 2: Đỉnh núi trí tuệ

A teacher has a bag of sweets for her students. If each student is given 4 sweets, the remaining number of sweets is 4. If each student is given 5 sweets, the given will be short of 20 sweets. How many students are there? Answer: 24

Giải:

Anna had 15 apples at first. She gave 1/5 of her apples to her brother and she gave 1/3 of her apples to her younger sister. How many apples does she have now? Answer: 7

Giải:

Calculate: 19/2 - 15/4 = ... Answer: 5.75


Convert: 2dm 6cm = …m. (Write your answer as a decimal in the simplest form). Answer: 0.26

Convert: 3dm 5cm = …m. (Write your answer as a decimal in the simplest form). Answer: 0.35

Convert: 4hg 7g = …kg. (Write your answer as a decimal in the simplest form). Answer: 0.407

Convert: 5kg 4g = …kg. (Write your answer as a decimal in the simplest form). Answer: 5.004

Convert: 5m 9mm = …m. (Write your answer as a decimal in the simplest form). Answer: 5.009

Find the average of 5 2/9 and 18 7/9? Answer: 12

Find the sum of all odd numbers from 1 to 100 which are not divisible by 13? Answer: 2292

Giải:

Find the value of x. Answer: 1.4


Find X such that X tonnes + 35kg = 935kg. Answer: 0.9


Given a number sequence: 2; 5; 7; 9; 2; 5; 7; 9; 2; 5; … What is the sum of the first 60 numbers? Answer: 345

Giải:

Given fraction 59/109. If its denominator increased by X units and its numerator is decreased by X units then new fraction will equal to 72/120. The value of X is … Answer: 4

Chú ý:

How many 3 - digit numbers are divisible by 35? Answer: 26

Giải:

How many numbers are there when divided by 9, the quotient and the remainder are the same? Answer: 9

Giải:

In 45.357, which digit is in hundredths place? Answer: 5

In 172.641, which digit is in thousandths place? Answer: 1

In 172.641, which digit is in tenths place? Answer: 6

In 436.718, which digit is in hundreds place? Answer: 4

In 941.046, which digit is in tens place? Answer: 4

The product of 3/8 and 1 1/15? Answer: 0.4


The sum of two numbers is 176. Their ratio is 4/7. Find the smaller number? Answer: 64


The sum of seven consecutive natural number is 4725. The greatest number is… Answer: 678

Giải:

The value of the digit 2 in 39201 is … Answer: 200

Write 4 27/100 as a decimal number in the simplest form. Answer: 4.27


Write the decimal that has: six units, two - tenths. Answer: 6.2

Write the decimal that has: three thousands and four units, eight thousandths. Answer: 3004.008

Write the decimal that has: twenty - nine units and fifteen hundredths. Answer: 29.15

Bài thi số 3: Đi tìm kho báu

1/5 of number A equal 1/7 of number B. What the possible minimum sum of  number A and B? Answer: 12

Giải:

309 digits have been used for numbering the page numbers of a book (the book starting at number 1). How many pages does the book have? Answer: 139

Giải:

A 4 - digit number is both divisible by 3 and 5. If it begins with the digit 7 then its greatest possible value is … Answer: 7905


A 4 - digit number is both divisible by 3 and 5. If it begins with the digit 7 then its greatest possible value is … Answer: 7995


Alison is 30 years younger than her father. Her father’s age will be 3 times her age in 5 years’s time. How old is Alison now? Answer: 10

Giải:

Calculate: 3/(1x2) + 3/(2x3) + 3/(2x3) + 3/(3x4) + … + 3/(56x57) = … Answer: 56/19

Giải:

Convert: 1km 4m = …m. Answer: 1004

Find B, if B is 72 more than the average 89; 142; 51 and B. Answer: 190

Giải:

Find the average of 14/5 and 46. Answer: 24.4

Find the value of x. Answer: 0.5


If   is divisible by 2; 3 and 9 then a = … Answer: 6

In 56.192, which digit is in the tens place? Answer: 5

In 209.026, which digit is in the tenths place? Answer: 0

In 361.704, which digit is in the hundreds place? Answer: 3

Patsy has some beads. She gives 21 of the beads to her sister. After that, she given 13 beads another to her best friend. She has 9 beads left. How many beads does she have first? Answer: 43

Giải:

The average of numbers from 25 to 71 is … Answer: 48

The cost of 26 boxes of crayons and 17 boxes of pencils is $129. The cost of each box is the same. How much is each box? Answer: $3

The perimeter of the rectangle below is 2052cm. Its width is …dm. Answer: 15

Giải:

The sum of two numbers a and b is 160. When a divided by b, it’s the quotient and the remainder are 9 and 10 respestively. Find the two numbers a and b. Answer: a = 145 and b = 15

Giải:

Which of following decimal numbers is equal to 27/15? Answer: 1.8

Write 0.04 as a fraction. The result is … Answer: 4/100

Write 0.23 as a fraction with denominator of 100. Answer: 23/100

Write 5.17 as a mixed number in the simplest form. Answer: 5 17/100


Write the decimal that has: Thirty - nine units, two - hundredths. Answer: 39.02

Write the decimal that has: Zero units, seven - tenths. Answer: 0.7

Which of the following does NOT reprent 1/4? Answer: 1/2

Các bạn có thể tải toàn bộ: Đề và đáp án vòng 6 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Bài thi số 1: Sắp xếp


Sắp xếp theo thứ tự bên dưới (từ trái qua phải, từ trên xuống dưới):

0.03	0.12	1.09	1.52
5.61	7.84	8	9.27
9.61	3.16 + 6.84	7.81 + 9.25	6.93 + 12.31
25	15.72 + 12.29	The sum of 22.15 and 15	Fifty units and eighteen hundredths
25.81 + 34.09	35.07 + 35.03	Eighty units and one hundredths	Eighty - five and seven tenths
37.05 + 58.03 + 29.92	The sum of 201.002 and 13.84	172.89 + 94.05 + 27	Three hundreds and one thousandths
Four hundreds and nine tenths

Bài thi số 2: Đi tìm kho báu

20 people are needed to tile floor in 3 days. How many people are needed to tile floor in 5 days? (Everyone has the same productivity). Answer: 12

Giải:

Calculate: 4.02 + 3.71 = … (Write your answer as a decimal in the simplest form). Answer: 7.73

Calculate: 4m38cm + 3m2dm = …m. (Write your answer as a decimal in the simplest form). Answer: 7.58

Calculate: 34.21 + 28.97 = ... Answer: x = 63.18

Calculate: 34.82 + 17.06 + 23.61 = … (Write your answer as a decimal in the simplest form). Answer: 75.49

Calculate: 36.27 + 18.94 = … (Write your answer as a decimal in the simplest form). Answer: 55.21

Calculate: 72.31 + 27.64 + 41 = … (Write your answer as a decimal in the simplest form). Answer: 140.95

Compare: 5.04 … 5.040. Answer: =

Compare: 39.92 … 39.879. Answer: >

Compare: 46.29 … 46.3. Answer: <

Convert: 2.15km = …m. Answer: 2150

Convert: 7km38m = …km. (Write your answer as a decimal in the simplest form). Answer: 7.038

Convert: 8m6dm = …m. (Write your answer as a decimal in the simplest form). Answer: 8.6

Convert: 41m25cm = …m. (Write your answer as a decimal in the simplest form). Answer: 41.25

Convert: 600kg = …tonnes. (Write your answer as a decimal in the simplest form). Answer: 0.6

Convert: 801cm = …m. (Write your answer as a decimal in the simplest form). Answer: 8.01

Fill the suitable number in the follwing blank. 7cm²20mm² = …cm². (Write your answer as a decimal in the simplest form). Answer: 7.2

If a = 3.2, b = 4.9 and c = 6.8 then (a + b) + c = … (Write your answer as a decimal in the simplest form). Answer: 14.9

If a and b are consecutive even numbers and a > 7.47 > b, then a x b = … Answer: 48

Giải:

If a and b are consecutive odd numbers and a > 59.2 > b, then a + b = … Answer: 120

Giải:

If n is natural number and 38.02 < n < 39.84 then n = … Answer: 39

If p is an odd number and 82.63 < p < 84.28 then p = … Answer: 83

In the follwing numbers, which is the greatest? 6.32; 7.39; 6.81; 7.91; 7 (Write your answer as a decimal in the simplest form). Answer: 7.91

In the follwing numbers, which is the smallest? 6.41; 4.53; 10.24; 18.59; 5 (Write your answer as a decimal in the simplest form). Answer: 4.53

In the follwing numbers, which is the smallest? 9.04; 8.23; 8.67; 9; 8.9. (Write your answer as a decimal in the simplest form). Answer: 8.23

The length of a rectanglular garden is 60m, the width is 2/3 of the length. What is the area of the garden in square meters? Answer: 2400

Giải:

The ratio of the number of James’s marbles to the number of Tom’s marbles was 4 : 3. After James gave Tom 10 marbles, the ratio became 3 : 4. How many marbles did James have at first? Answer: 40

Giải:

Write the decimal “six units, eight tenths” … (Write your answer as a decimal in the simplest form). Answer: 6.8

Write the decimal “Zero units, fourteen hundredths”. (Write your answer as a decimal in the simplest form). Answer: 0.14

Write the following decimals in increasing order: 2.43; 2.38; 4.01; 5.36. Answer: 2.38; 2.43; 4.01; 5.36


Bài thi số 3: Cóc vàng tài ba

Giải:

Arrange the numbers below in order, from the greatest to the least value. 3.04; 2.73; 7.52; 7.95. Answer: 7.95; 7.52; 3.04; 2.73


A number is added to 35. Then the sum is multiplied by 4 and the product is divided by 21. The result is 8. What is the number? Answer: 7

Giải:

A rectangle has a width of 27.45m. the length is 3.56m longer than the width. Find the perimeter of that rectangle? Answer: 116.92m

Giải:

Calculate: 8.34 + 37.05 + 26.25 = ... Answer: 71.64

Calculate: 9.02 + 12.36 = ... Answer: 21.38

Convert: 34m5dm = …m. Answer: 34.5

Convert: 1204g = …kg. Answer: 1.204

Find the average of all 2 - digit odd numbers? Answer: 55

Giải:

Find x if x - 9.37 = 31.04. Answer: x = 40.41


Find x if x - 42.73 = 15.92. Answer: x = 58.65


How many 2 - digit even numbers are less than 68.24? Answer: 30

Giải:

How many 2 - digit numbers are less than 14.62? Answer: 5

Giải:

How many 2 - digit odd numbers are greater than 23.01? Answer: 38

Giải:

How many distinct 2 - digit numbers from 10.93 to 45.02? Answer: 31

Giải:

How many even numbers between 26.92 and 82.19? Answer: 28

Giải:

How many two - digit natural numbers are greater than 45.28? Answer: 5

Giải:

If 45ab5 is divisible by 9 and a + b less than 10, find the possible value of a + b? Answer: 4

Giải:

Shane is 8 years old and his mother is 34 years old. How many years’ time will his mother’s age be 3 times his age? Answer: 5

Giải:

The perimeter of a rectangle is equal to the perimeter of the square on the right. If its width is 8 cm them its area is … cm2. Answer: 96

Giải:

The sum of thre consecutive numbers is 1437. Find the smallest number? Answer: 478

Giải:

There are three oil barrels. The first barrel contains 36.3l, the second barrel contains 32.6l, the third barrel contains 25.8l. How many liters of oil are there in total? Answer: 94.7l

Giải:

What is the area of this figure in square centimetres? Answer: 28

Giải:

Which of the follwing is the greatest? Answer: 4.87 + 2.94


Which of the follwing is the smallest? Answer: 5m


Which of the follwing is the smallest? Answer: 2.74 + 3.08


Which of the follwing is the greater than 9? Answer: 9.03


Which of the follwing numbers is less than 7? Answer: 6.93

Các bạn có thể tải toàn bộ: Đề và đáp án vòng 7 thi Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây.

Bài thi số 1: Tìm cặp bằng nhau

0.083 = 0.83 : 10	0.0902 = 9.02 x 0.01
0.12 = 1.2 : 10	1.9 = 0.019 x 100
3.4 = 0.34 x 10	6.7 = 13.4 x 0.5
8.83 = 70.64 : 8	10 = 36.1 - 26.1
19.09 = 1909 : 100	29.4 = 4.9 x 6
65 = 54.61 + 10.39	69.62 = 24.9 + 30.02 + 14.7
96.88 = 34.6 x 2.8	109.5 = 547.5 : 5
160.8 = 16.08 x 10	188.63 = 251 - (28.1 + 34.27)

Bài thi số 2: Điền kết quả thích hợp vào chỗ (...):

Fill in the blank with the suitable number (Note: write decimal number with "the dot" between number part and fraction part. Example: 0.5)

Câu 1:
4.62 x 7.5 = 7.5 x 4.62
The missing number is  
(Write your answer as a decimal in the simplest form)

Câu 6:
163.4cm - 45.24cm = 118.16 cm.
The missing number is {}
(Write your answer as a decimal in the simplest form)

Câu 9:
A rectangular garden is 25.04m long, the width is 3/4 of the length. Find the perimeter of the garden?
Answer: 87.64 m
(Write your answer as a decimal in the simplest form)

Câu 10:
A rectangle has width of 18.25m. The length is 4.75m longer than the width. Find the area of that rectangle?
Answer: The area of that rectangle is 419.75 m².  
(Write your answer as a decimal in the simplest form)

Câu 3:
Calculate: 4.72 x 100 = 472

Câu 8:
Calculate: 5dm7cm + 8m4dm = 8.97
(Write your answer as a decimal in the simplest form)

Câu 2:
Calculate: 7.34 - 6.27 = 1.07
(Write your answer as a decimal in the simplest form)

Câu 4:
Calculate: 21.8 x 5 = 109

Câu 2:
Calculate: 28.2 + 31.95 = 60.15
(Write your answer as a decimal in the simplest form)

Câu 4:
Calculate: 36.26 x x 10 = 362.6
(Write your answer as a decimal in the simplest form)

Câu 5:
Calculate: 42.75 x 39 - 42.75 x 29 = 427.5
(Write your answer as a decimal in the simplest form)

Câu 9:
Calculate: (48.6 x 2.4 - 24.3 x 4.8) x 20.15 x 46.92 = 0

Câu 3:
Calculate: 57.71 - 35.29 = 22.42
(Write your answer as a decimal in the simplest form)

Câu 1:
Calculate: 84.4 : 8 = 10.55
(Write your answer as a decimal in the simplest form)

Câu 6:
Calculate: 345.58 x 4.9 - 45.58 x 4.9 = 1470

Câu 5:
Find the value of 2.8 x (4.3 + 8.1).
Answer: 34.72
(Write your answer as a decimal in the simplest form)

Câu 8:
Find the value of x such that x + 8.04 - 9.34 = 16.31.
Answer: x = 17.61
(Write your answer as a decimal in the simplest form)

Câu 4:
Find the value of x such that x + 47.92 = 89.27.
Answer: 41.35
(Write your answer as a decimal in the simplest form)

Câu 9:
Half of the perimeter of a rectangular school yard is 0.24km. The width is 1/2 of the length. Find the area of the yard in square meters?
Answer: The area of the yard is 12800 m²

Giải:

Câu 3:
Multiply: 2.34 x 7 = 16.38
(Write your answer as a decimal in the simplest form)

Câu 5:
The sum of the smallest 3-digit number and 27.02 is 127.02
(Write your answer as a decimal in the simplest form)

Câu 7:
The sum of two numbers is 10.54 and their difference is 1.94. The greater number is 6.24
(Write your answer as a decimal in the simplest form)

Câu 7:
The value of 5.25 4.2 +8.91 is 30.96
(Write your answer as a decimal in the simplest form)

Câu 10:
Tom bought 3.5kg apples and 2.4kg oranges. If the apples cost 5 dollars per kilogram and the oranges cost 6 dollars per kilogram. How much did Tom spend altogether?
Answer: 31.9 dollars
(Write your answer as a decimal in the simplest form)

Câu 10:
What is the difference between the largest and the smallest possible distinct 4-digit number that you can make from four digits 0, 4, 2 and 3?
Answer: Their difference is 2286

Bài thi số 3: Vượt chướng ngại vật

Calculate: 4.75 x 8.2 : 2 = … Answer: 19.475

Calculate: 8.4 x 2.6 - 8.92 = … Answer: 12.92

Calculate: 11.13 + 13.15 + 15.17 + 17.19 + 19.21 + 21.23 + 23.25 + 25.27 + 27.29 + 29.31 + 31.33 = …hm. Answer: 233.53

Convert: 9km 72m = …hm. Answer: 90.72

Find two numbers if their sum is 13.96 and their difference is 2.72 Answer: 8.34 and 5.62

If: x x 4 = 21.64 then 2.5 x x = … Answer: 13.525

If: x is a natural number and x > 25.092 then the smallest value of x is … Answer: 26

Multiply: 0.025 x 400 = … Answer: 10

Multiply: 37.92 x 0.01 = … Answer: 0.3792

Multiply: 241.82 x 0.1 = … Answer: 24.182

There are 9 packages of rice which weigh 403.74kg. How many kilograms do 15 such packages of rice weigh? Answer: 672.9

There are 362 tonnes of rice in a store. They took out 271.48 tonnes of rice. How many tonnes of rice are left in the store? Answer: 90.52

Trên cơ sở đề thi cấp huyện năm học 2015 - 2016, mình bổ sung thêm lời giải nhằm giúp cho các bé có tài liệu ôn thi, thêm tự tin khi bước vào vòng thi cấp huyện năm học 2016 - 2017.

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Exam 1: Đi tìm kho báu

A clothing shop is having a 40% off sale. How much would Jane have to pay for a $30 sweater with a discount? Answer: $18

Giải:

A motorbike at Store A costs $900. The regular price of the same motorbike at Store B is 10% more than it is at Store A. The motorbike is on sale at Store B for 10% off of the regular price. What is the sale price of the motorbike motorbike at Store B? Answer: $891

Giải:

Anna, Bella, Charlie, Daniel, and Elly are sitting in the 5 chairs around a circular table. Charlie and Elly are sitting beside each other. Anna and Daniel are not sitting beside each other. The 2 people who are seated on either side of Bella are… Answer: Anna and Daniel

Giải:

As shown in the figure, some of the squares are painted black. If we wish to have 50% of the whole figure black, how many more squares must be panited black? Answer: 6

Giải:

How many rectangles are there in the follwing figure? Answer: 11

Giải:

If a pen costs $1.75 and an eraser costs $0.85, which of the following is the cost of 10 erasers and 5 pens? Answer: $17.25

Giải:

If each of the four numbers 2, 4, 5 and 7 replaces a □, what is the largest possible sum of the fractions shown? Answer: 19/4
 

Giải:

If the area of the rectangle ABCD is 60cm2 then the area of the trapezoid MNCD is …cm2. Answer: 50

Giải:

In a school, a total of 360 students voted for their favourite subject. The results are shown in this pie chart. How many students voted for Math? Answer: 144
 

Giải:

Look at the partern: 19/20 = 0.95, 21/20 = 1.05, 23/20 = 1.15. What decimal is equal to 17/20? Answer: 0.85

Giải:

The average of five consecutive even numbers is 40. The average of the smallest and largest of these number is ... Answer: 40

Giải:

The price of a pair of shoes after one 10% sale is $22.5. The original price of the shoes is $... Answer: 25

Giải:

There are 40 students in Mrs. Brown’class. 25% of her students received a B on the test. How many students received a B? Answer: 10

Giải:

What is the product of 3.05 and 2.8? Answer: 8.54

Giải:

Which decimal is equal to 9/16? Answer: 0.5625

Giải:

Write 45% as a fraction. The result is… Answer: 9/20

Giải:

Exam 2: Tìm cặp bằng nhau


Exam 3: Fill in the blank with the suitable number

Question 7:
A bag contains green marbles and red marbles only. If the ratio of the number of green marbles to the number of red marbles is 1:4 then 20 % of marbles are green.

Giải:

Question 8:
Alice is going to the store. One third of the way to the store, she stops to talk with Kelly. She then continues for 6 km and reaches the store. How many kilometres does she travel?
Answer: 9 km.

Giải:

Question 3:
At the beginning of the summer, Bob was 140 cm tall. At the end of the summer, he measured his height again and discovered that it had increased by 5%. Measured in cm, what was his height at the end of summer?
Answer: 147 cm.

Giải:

Question 1:
Bella scores on six of her eight pictures. The percentage of pictures that she does not score on is 25 %.

Giải:

Question 9:
How many different 3-digit whole numbers can be formed using the digits 4, 5, 0 and 8, assuming that no digit can be repeated in a number?
Answer: There are 18 numbers.

Giải:

Question 6:
How many even numbers between 1 and 100 are divisible by 5?
Answer: There are 9 numbers.

Giải:

Question 5:
How many three-digit numbers are exactly 19 more than a two-digit number?
Answer: 19 numbers.

Giải:

Question 10:
In the 3×3 table shown, the numbers 2, 4 and 6 are placed so that each number occurs only once in each row and only once in each column. The value of M+N is 6  

Giải:

Question 4:
The length of each edge of a cube is 3 cm. The surface area of the cube, in cm², is 54

Giải:

Question 6:
The area of the figure shown is 16
(All the sides are measured in the same units)

Giải:

Question 2:
The number of centimetres in 7.05 metres is 705

Giải:

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Bài thi số 1: Đi tìm kho báu

26 : 5 = … The missing decimal number is ... (Write your answer as a decimal in the simplest form). Answer: 5.2

Giải:

A rectangular parcel has length of 26m and a width of 20m. they used 30% of the area to dig a pond. What is the area of the pond? Answer: 156

Giải:

A washing machine at Store A costs $820. The regular price of the same washing machine at Store B is 10% more than it is at Store A. The washing machine is on sale at Store B for 10% off of the regular price. What is the sale price of the washing machine at Store B? Answer: 811.8

Giải:

A women spends a capital of $108 on buying vegetables. After selling all the vegetables, she received $135. What percent of the capital is profit? Answer: 25

Giải:

Calculate: 42.1% + 81.09% = …%. (Write your answer as a decimal in the simplest form). Answer: 123.19

Giải:

Compare: 5 3/5 ... 5.35. Answer: >

Giải:

Compare: 6 8/9 ... 6.89. Answer: <

Giải:

Compare: 13.25 ... 13 3/12. Answer: =

Giải:

Emily is 3 years younger than her brother. Her father’s age is four times her brother’s age and 33 years older than Emily. How old is her brother? Answer: 10

Giải:

Fill in the blank with the correct decimal: 5dam²2dm² = …m². (Write your answer as a decimal in the simplest form). Answer: 500.02


Find 30% of 462. (Write your answer as a decimal in the simplest form). Answer: 138.6

Giải:

Find x, if x x 2.6 = 27.7 + 76.3. (Write your answer as a decimal in the simplest form). Answer: 40

Giải:

Find x, if x x 7.4 = 63.64. (Write your answer as a decimal in the simplest form). Answer: 8.6

Giải:

How many distinct 3 - digit even number can you make by using 8; 3; 9; 0 and 6? Answer: 30

Giải:

How many distinct 3 - digit numbers can you make by using 6; 7; 1; 0; 2 and 4? Answer: 100

Giải:

Kerry has 80 marbles, 15% of the marbles are blue, 25% of the marbles are red and the rest of the marbles are yellow. How many yellow marbles does he have? Answer: 48

Giải:

Mary had $136. She spent 65% of the money on a overcoat. How much money did she have left? Answer: 47.6

Giải:

Rice is stored enough for 120 people for 24 days. After 4 days, there are further 30 new people. How many days does it take to use up that remaining rice? Answer: 16

Giải:

The area rectangular garden is 126m², the width is 8,4m. what is the length of the garden in meters? Answer: 15


The price a television decreased from $310 to $270. Find the percentage of decrease in price. (Round off your answer to the nearest whole number). Answer: 13

Giải:

Tom and Fred have 84 marbles altogether. Tom has 25% less marbles than Fred. How many marbles does Fred have? Answer: 48

Giải:

Wendy lost $34 which is 8% of the capital. Find capital of Wendy. Answer: 425

Giải:

What is the product of 4.72 and 9.5? (Write your answer as a decimal in the simplest form). Answer: 44.84

Giải:

Which decimal is equal to 21/15? (Write your answer as a decimal in the simplest form). Answer: 1.4

Giải:

Bài thi số 2: Web tự luận

Câu 5:
4.8l of oil weigh 3.648kg. How many liters of oil are there if they weigh 4.864kg?
Answer: There are 6.4 liters
(Write your answer as a decimal in the simplest form)

Giải:

Câu 3:
84 : 8 = ...
The missing decimal number is 10.5
(Write your answer as a decimal in the simplest form)

Giải:

Câu 6:
A rectangular field has a width of 24.5m and its area equals the area of a square with the sides of 35m. Find the perimeter of that rectangular field.
Answer: 149 m

Giải:

Câu 4:
Calculate: 14.9% x 7 = 135.8 %
(Write your answer as a decimal in the simplest form)

Câu 8:
Calculate: (48.23 - 14.81) : 12 = 2.785
(Write your answer as a decimal in the simplest form)

Câu 4:
Calculate: 86.8 : 3.5 = 24.8
(Write your answer as a decimal in the simplest form)

Câu 3:
Calculate: 100 + 7 + 3/10 = 107.3
(Write your answer as a decimal in the simplest form)

'Câu 2:
Calculate: 184 : 4.6 = 40

Câu 1:
Calculate: 200 + 20 + 0.02 = 220.02
(Write your answer as a decimal in the simplest form)

Câu 1:
Find 42% of 453kg?
Answer: 190.26 kg
(Write your answer as a decimal in the simplest form)

Giải:

Câu 10:
Find the remainder when dividing 104 by 3.8, if we stop dividing at the second decimal place of the quotient.
Answer: 0.032
(Write your answer as a decimal in the simplest form)

Giải:

Câu 5:
Find  x, if x : 5.6 21.8 = 25.6.
Answer: x = 21.28
(Write your answer as a decimal in the simplest form)

Câu 9:
In a class of 30 students, 20% of them go to school by bike. One third of the remaining students go to school by bus. How many students go to school by bus?
Answer: There are 8 students go to school by bus.

Giải:

Câu 7:
Inspecting products of a factory, we find that there are 97 qualified products out of every 100 products on average. What percent of the total products is qualified products?
Answer: 97 %

Giải:

Câu 9:
How many 3-digit odd numbers can you make by using 3, 2, 5, 4 and 6?
Answer: There are 50 numbers

Giải:

Câu 10:
Sarah had some sweets. If she gave each friend 5 sweets, she would need another 5 sweets. If she gave each friend 9 sweets, she would need another 41 sweets. How many friends had received sweets from Sarah?
Answer: 9 friends

Giải:

Câu 10:
The area of a triangle ABC is 240dm², take the point M on BC such that BM=MC and the point N on AC such that AN=NC. Find the area of the triangle AMN.
Answer: 60 dm²

Giải:

Câu 5:
The last digit of the product 8 x 11 x 14 x ... x 38 x 41 x 44 is 0

Giải:

Câu 8:
The price of a pair of shoes is 36.4 dollars after a 20% discount. Find the original price of a pair of shoes.
Answer: The original price of a pair of shoes is 45.5 dollars.
(Write your answer as a decimal in the simplest form)

Giải:

Câu 1:
The value of digit 1 in 27.01 is 0.01
(Write your answer as a decimal in the simplest form)

Giải:

Câu 2:
The value of digit 3 in 231.02 is 30

Giải:

Câu 6:
There are 2.46kg of salt in 60kg of sea water. Find the percentage of salt in sea water.
Answer: 4.1 %
(Write your answer as a decimal in the simplest form)

Giải:

Bài thi số 3: 12 con giáp

A man sold 204kg of rice, 75% of the amount of rice he sold is ordinary rice. How many kilograms of ordinary rice did he sell? Answer: 153kg

Giải:

A teacher has a bag of sweets for her students. If each student is given 4 sweets, the remaining number of sweets is 29. If each student is given 5 sweets, the remaining number of sweets is 5. How many sweets does the teacher have? Answer: 125

Giải:

At the end 2014, the population of a town was 21904 people. At the end 2015, the population of a town was 22218 people. From the end 2014 to the end of 2015, what percent did the population of this town increase by? (The result is rounded to the first decimal place). Answer: 1.4%

Giải:

Calculate: 514 : 12.5 = … Answer: 41.12

Giải:

Calculate: S = 12/10 + 12/40 + 12/88 + 12/154 + 12/238 + 12/340 =... Answer: 9/5

Giải:

If O + □ = 20; O + ∆ = 26; □ + ∆ = 30 then ∆ = ... Answer: 18

Giải:

Find 24% of 271kg? Answer: 65.04kg

Giải:

Find 52% of 83km? Answer: 43160m

Giải:

Find the area of a triangle with a base is 28.6m and a height 14m corresponding. Answer: 200.2m²

Giải:

Find the area of right triangle ABC. Answer: 30

Giải:

Find the value of x such that: x + 4/3 = 15/9. Answer: 1/3


Five students do an exam with the maximim score of 100. The scores of four of the students are 92, 83, 90 and 87. The average of five students’scores is the same as the score of the fifth student. Find the score of the fifth student. Answer: 88

Giải:

How many 4 - digit numbers divisible by 2 can be form digits 0, 2, 5, 6, 9? Answer: 300

Chú ý:

If the monthly interest rate is 0.65%, how much deposit is needed so that after one month, the profit is $52? Answer: $8000

Giải:

If x a natural number and x < 172.02 then the greatest value of x is … Answer: 172


It takes 3.2m of fabric to make a set of clothes. How many sets of clothes can be make with 329.4m of fabric? Answer: 102

Giải:

Jack bought 12 boxes of apples. There were 105 apples in each box. He repacked all the apples into packets of 10. How many packets of apples were there? Answer: 126

Giải:

Jeny has 75 red balls and blue balls, 40% of which are blue balls. How many blue balls are there? Answer: 30

Giải:

The area of the circle is 47.1cm². find the area of square? Answer: 60

Giải:

Write 36% as a fraction. The result is … Answer: 9/25


Write 39% as a fraction. The result is … Answer: 39/100


Write 72% as a fraction. The result is … Answer: 18/25


Write 83 7/5 as a decimal. The result is … Answer: 84.4

Trên cơ sở đề thi cấp tỉnh năm học 2015 - 2016, mình bổ sung thêm lời giải nhằm giúp cho các bé có tài liệu ôn thi, thêm tự tin khi bước vào vòng thi cấp tỉnh.

Các bạn có thể tải toàn bộ: Đề và đáp án ôn thi vòng 9 (vòng tỉnh) Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2015 - 2016 tại đây.

Exam 1: Vượt chướng ngại vật

1.83 + … = 2. The missing number is … Answer: 0.17

16 is what percent of 80? Answer: 20

A cube has a volume of 64cm³. The area of one face of the cube is …cm². Answer: 16


After running 20% of a race, Bob had run 25m. How long was the race, in metres? Answer: 125

Alice are going to buy sugar for her cooking class. She need to have  kg of sugar for every students in her class. There are 18 students in her class. How many kilogram of sugar should Alice buy? Answer: 3

Alice’s mathematics exam had 30 algebra questions and 50 geometry questions, each worth 1 mark. She got 70% of the algebra questions correct, and 60% of her questions correct. How many geometry questions did she answer correctly? Answer: 27

Find x such that x : 4 = 0.625. Answer: 2.5


Jack need to earn enough money to buy a new skateboard that costs $48.45. He has $15.34? How much money does he need to buy the skateboard? Answer: 33.11

Lucy has played 20 games and has a 95% winning percentage. Without losing any more games, how many more games must he win to reach exactly a 96% winning percentage? Answer: 5

The distance from Anna’s house to the store is 1/2 mile. Anna run to the store twice a day, 7 days a week for 3 weeks. How many miles does she run in total? Answer: 21


What is the quotien of 0.51 and 17? Answer: 0.03

Exam 2: Fill in the blank with the suitable number

Question 1:
Jack rides his horse with a constant speed of 12 miles per hour. How far can he travel in 1 1/2 hours?
Answer: 18 miles.

Question 2:
Bob roller skates with a constant speed of 14 miles per hour. How far can he travel in 1/2 hour?
Answer: 7 miles.

Question 3:
Emily rides her bike with a constant speed of 12km/h. How far can she travel in 3 hours?
Answer: 36 km.

Question 4:
An airplane flies with a constant speed of 810 miles per hour. How far can it travel in 4 1/2 hours?
Answer: 3645 miles.

Question 5:
John drove from Town A to Town B in 5 hours. His average speed for the first 3.5 hours was 64km/h. His average speed for the last 1.5 hours was 60km/h. What was the total distance he traveled?
Answer: 314 km.

Giải:

Question 6:
A car traveled at 50km/h for 2 hours and at 60km/h for 3 hours. What is the car’s average speed?
Answer: 56 km/h

Question 7:
Bob drove from City P to City Q. He traveled the first 36km at an average speed of 54km/h. He traveled the remaining 96km at a average speed of 72km/h. Find his average speed for the whole trip.
Answer: 66 km/h.

Giải:

Question 8:
The distance between John’s home and the park is 3000m. John walked from his home to the park at a speed of 100m per minute and then walked back home at a speed of 150m per minute. What is the John’s average speed in meter per minute?
Answer: 120 meter per minute.

Question 9:
A train crosses a tree in 10 second and a bridge 225m long in 25 second. Find the length of the train.
Answer: 150 m.

Giải:

Question 10:
Peter and Jacob were running. Both of them run with their constant speeds. They started at the same time and the same place. When Jacob reached the finishing line, Peter had only run 5/8 of what Jacob had run. Jacob’s speed is 75m/min (metre per minute) faster than Peter. What was Peter’s speed in m/min?
Answer: 125 m/min.

Giải:

Exam 3: Cóc vàng tài ba

A box contains 21 disks, each coloured red, blue and green. There are twice as many green disks as red disks, and half as many blue as red. How many disks are red? Answer: 6

Charlie and Lily go on a 24 km run. They both usually run at 9 km/h. If Charlie runs at 2/3 his usual running speed, and Lily runs at 4/3 times her usual speed, how many more hours does it take Charlie to complete the run than it takes Lily to complete the run? Answer: 2

Each face of a cube is painted with exactly one colour. What is the smallest number of colours needed to paint a cube so that no two faces that share an edge are the same colour? Answer: 3

If the numbers: 2/5; 41% and 0,401 are arranged from largest to smallest, the correct order is ... Answer: 41%; 0,401; 2/5

In the diagram, the percentage of small squares that are shaded is …

Answer: 36%

Susan wants to divide 35,5 kg sugar in small bags. If each bag holds 0,5kg, how many bags are needed? Answer: 71

The number of centimetres in 2,5 metres is … Answer: 250


The results of a survey of the hair colour of 500 people are shown in this circle graph. How many people have blonde hair?

Answer: 150

You walk 2 miles with your dog in only 40 minutes. Your average speed is ...  Answer: 0,05 mile in per minute

Do bận làm đề và đáp án Toán tiếng Việt lớp 4 và 5 vòng 16 nên xin phép lời giải mình sẽ cập nhật sau. Mong các bạn hết sức thông cảm. Trong quá trình ôn luyện, nếu có câu hỏi nào cần lời giải thì các bạn cứ đăng bên dưới bài viết này, mình sẽ đánh máy lời giải bài đó và đưa lên. Thành thật cáo lỗi vì sự bất tiện này.

Đề và đáp án ôn thi vòng 9 (vòng tỉnh) Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2015 - 2016 đã được đăng riêng tại đây. Để người đọc khỏi mất thời gian tìm kiếm, mình xin phép được trích đăng lại.

Các bạn có thể tải toàn bộ: Đề thi và đáp án vòng 9 (vòng tỉnh) Toán tiếng Anh (Math ViOlympic) lớp 5 năm học 2016 - 2017 tại đây hoặc đây.

Exam 1: Sắp xếp


Sắp xếp theo bảng bên dưới (từ trái qua phải, từ trên xuống dưới):

0.01dm3	0.103dm3	0.7dm3	1/1000 m3
1.28dm3	2000cm3	0.01dm3 x 0.8	8.04dm3 x 0.8
7.09dm3	67/4 dm3	46020cm3	356dm3
304dm3 + 217dm3	427dm3 x 2	1m3	1 1/999 m3
14/5 m3	27m3	35m3 + 27m3	42m3 + 39m3
123m3	74m3 x 2 + 12m3	178000dm3	202302dm3
218m3	56m3 + 56m3 + 56m3 x 2	261m3 + 183m3	120% of 272m3
90% of 521m3	61m3 + 183m3 x 4

Bài thi số 2: Đừng để điểm rơi

Calculate: 77.01 + 37.93 - 36.2 x 2 (Write your answer as a decimal in the simplest form). Answer: 42.54

Giải:

Choose any three digits from 1 to 9 to form a 3 - digit number and each digit is chosen only once. How many of these have the sum of all digits equal to 13? Answer: 42

Giải:

Compare: 45.72 + 71.03 … 28.9 x 4.5 Answer: <

Giải:

Convert: 2890cm² = …dm². (Write your answer as a decimal in the simplest form). Answer: 2.89


Find the greatest 3 - digit number such that the product of its digits is 432? Answer: 986

Giải:

Find the last 3 digits of 8 + 88 + 888 + 8888 + … + 8…88 (88 digit 8). Answer: 464

Giải:

Given a triangle ABC, take the point D on AB such that AD = 2DB, take the point E and G on AC such that AE = EG = GC and take the point H on BC such that BH = 2HC. Find the area of BDEGH if the area of triangle ABC is 180cm². Answer: 120

Giải:

How many numbers can be formed from the digits 0; 2; 4 and 5, each digit can be used only once in each number? Answer: 49

Giải:

There are 15 guests at a party. Each guest shakes hands exactly once with each of the other guests. How many handshakes have taken at the party? Answer: 105

Giải:

What is the quotient of 0.76 and 19? (Write your answer as a decimal in the simplest form). Answer: 0.04

Giải:

Bài thi số 3: 12 con giáp

A rectangular wooden block has the dimensions as shown in the figure. A cube with side length of 3cm has been cut out. Find the volume of the rest of the wooden block? Answer: 113cm³

Giải:

Calculate: 1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 + 9 - 10 - 11 + 12 + … + 100 + 101 = … Answer: 101

Giải:

Calculate: 2.5g + 2.5g x 3 = …kg. Answer: 0.01

Giải:

Convert: 1 3/5 dm³ = ...cm³. Answer: 1600

Giải:

Find the 7th term in the sequence: 1.1; 2.2; 3.4; 4.7; … Answer: 9.2

Giải:

Find the sum of distinct 3 - digit numbers can be formed using the digits 1; 4; 7. Answer: 2664

Giải:

Find y such that y x 4.6 = 361.1. Answer: y = 78.5

Giải:

Given a square ABCD has a side of 6cm and a square DEFG has a side of 3cm. Find the area of triangle ACF? Answer: 18

Giải:

How do you write the measurement 106cm³ using words? Answer: One hundred and six cubic centimeters


In this sequence: 1, 2, 3, 5, 8, 13, … each number is the sum of the two previous numbers from the third number. How many odd numbers are there in the first 100 numbers? Answer: 67

Giải:

The sum of the ages of Shaun and Tom is 30. The sum of the ages of Shaun and John is 27. The sum of the ages of John and Tom is 31. Who is the youngest among the three boys? Answer: Shaun

Giải:

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