Trên cơ sở đề thi cấp huyện, tỉnh, quốc gia 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, tỉnh và quốc gia.

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

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:

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.