VTMO 2026 - Grade 3 - Semifinal - SET 12 - Self-study

Question 1

Find an odd three-digit number with three different digits. Its hundreds digit is the smallest even digit greater than 5, and its digit sum is 7.

1. 611
2. 610
3. 403
4. 511
5. 601

Question 2

Classes 3A and 3B plant trees around their school. For every 3 trees planted by class 3A, class 3B plants 5. After several days, class 3B has planted 12 more trees than class 3A. How many trees has class 3A planted?

1. 18
2. 21
3. 24
4. 30
5. 90

Question 3

During an outing in a nine-week challenge programme, Minh’s class 3B stands in one line. Minh is 10th from the front and 6th from the back. How many students are in the line?

1. 14
2. 15
3. 16
4. 17
5. 18

Question 4

Choose the figure that replaces the question mark in the sequence.

Question 5

Khang shades five identical sheets of paper, each marked with a $4\times4$ grid, as shown. Which figure has the greatest shaded area?

Question 6

Two brothers have 98 marbles altogether. After the older brother gives the younger brother 22 marbles, the younger brother has 10 more than the older brother. How many marbles did the older brother have at first?

1. 44
2. 60
3. 66
4. 88
5. Another answer

Question 7

An gets up late and reaches the bus stop at 9:05, 15 minutes after the bus departed. At what time did the bus leave?

1. 8:45
2. 8:50
3. 8:55
4. 9:15
5. 9:20

Question 8

An’s birthday is on Wednesday. Bình’s birthday is 17 days after An’s. On which weekday is Bình’s birthday?

1. Wednesday
2. Thursday
3. Friday
4. Saturday
5. Sunday

Question 9

How does 85 change when the digit 2 is written immediately to its left?

1. Increases by 200
2. Increases by 20
3. Becomes 20 times as large
4. Increases by 767
5. Decreases by 20

Question 10

A teacher says: “Think of a number, add 1, then double the result. Give that result to your neighbour. Your neighbour subtracts 1 from it and doubles the new result.” An starts with 6 and passes his result to Bình. What final number does Bình obtain?

1. 18
2. 24
3. 26
4. 27
5. 38

Question 11

Pi writes all the natural numbers from 1 to 40 on the board. How many are divisible by 2 but not by 5?

1. 4
2. 14
3. 15
4. 16
5. 20

Question 12

Fill in the missing number: $72=\square\times10-8$.

1. 5
2. 8
3. 10
4. 12
5. 15

Question 13

Which expression has the greatest value?

1. $4\times3+2+1$
2. $4+3+2+1$
3. $4+3\times2+1$
4. $4\times3+2\times1$
5. $4+3+2\times1$

Question 14

How many squares are there altogether in the diagram?

1. 4
2. 5
3. 6
4. 11
5. 12

Question 15

There are 8 identical bags of candy. Châu takes 6 candies from each bag. The total number remaining equals the number in 5 unopened bags. Each candy weighs 3 g. How many grams did the candies in all 8 bags weigh originally?

1. 120
2. 144
3. 240
4. 384
5. 468

Question 16

Five people eat five apples in five minutes. At the same eating rate, how many minutes do twenty people need to eat twenty apples?

1. 5 minutes
2. 10 minutes
3. 15 minutes
4. 20 minutes
5. 25 minutes

Question 17

Four people attend a party. When they leave, each person shakes hands with each of the others exactly once. How many handshakes are there?

1. 3
2. 4
3. 6
4. 9
5. 12

Question 18

On Monday afternoon, An, Minh and Phương go from school to a bookshop. An leaves at 2:00 p.m. and arrives at 2:40 p.m. Minh leaves at 2:05 p.m. and takes 25 minutes. Phương leaves at 2:15 p.m. and takes 20 minutes. In which order do they arrive, from earliest to latest?

1. An, Minh, Phương
2. Phương, Minh, An
3. Phương, An, Minh
4. Minh, An, Phương
5. Minh, Phương, An

Question 19

Which option shows the reflection of the picture in water? Enter the three-digit code printed beside your chosen picture.



Code 001



Code 002



Code 003



Code 004



Code 005

Question 20

The numbers 112 and 301 are three-digit numbers whose digits sum to 4. How many three-digit numbers have digit sum 4?