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VTMO 2026 - Grade 3 - Semifinal - SET 11 - Self-study

Question 1

What is the perimeter of the shape below, in centimetres?

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  1. 44
  2. 58
  3. 88
  4. 116
  5. 144

Question 2

If the length of a rectangle is increased by 3 m while its width stays the same, its area increases by $12\text{ m}^2$. What is its width, in metres?

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

Question 3

There are 13 passengers on a bus. At the first stop, 3 get off and 6 get on. At the second stop, 5 get off and 2 get on. At the third stop, 3 get off. How many passengers remain on the bus?

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  1. 10
  2. 3
  3. 11
  4. 13
  5. 16

Question 4

An, Bình and Chi are 20 years old in total. What will their total age be in 2 years?

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  1. 20
  2. 22
  3. 23
  4. 24
  5. 26

Question 5

Find the value of $20-10÷5+3$.

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  1. 7
  2. 13
  3. 19
  4. 21
  5. 23

Question 6

A frog starts at the entrance and finishes at the exit, collecting food along the way. It may move only left, up or down, along rows or columns. It cannot cross the hatched walls, and it may visit each small square only once. What is the greatest number of food pieces it can collect?

Question illustration
  1. 6
  2. 7
  3. 8
  4. 9
  5. 16

Question 7

A rectangular wall pattern is made of grey tiles and striped tiles. Some tiles have fallen off, as shown. How many grey tiles have fallen off?

Question illustration
  1. 5
  2. 6
  3. 7
  4. 8
  5. 9

Question 8

Thanh has 22 marbles and uses them to make figures following the pattern shown. What is the number of the largest figure Thanh can make? The pictures show figures 1, 2 and 3, from left to right.

Question illustration
  1. Figure 4
  2. Figure 5
  3. Figure 6
  4. Figure 7
  5. Figure 8

Question 9

How many squares in the diagram do not contain the star?

Question illustration
  1. 18
  2. 21
  3. 17
  4. 20
  5. 19

Question 10

Evaluate the expression in the picture. The brace indicates 93 occurrences of the number 7 altogether, including the two before the parentheses.

Question illustration
  1. 651
  2. 1373
  3. 1401
  4. 2024
  5. 2675

Question 12

Use each of the digits 2, 3, 4, 5, 6, 7 and 8 exactly once. The letters $U,V,W,X,Y,M,N$ stand for different digits. Find the smallest possible value of $\overline{UVW}-(\overline{XY}+\overline{MN})$.

Question illustration
  1. 70
  2. 73
  3. 82
  4. 172
  5. 165

Question 13

Which cube can be folded from the net below?

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Question 14

Fill in the missing number: $3×2+4×\square=30$.

Question illustration
  1. 3
  2. 6
  3. 10
  4. 12
  5. 18

Question 15

Which number cannot be the remainder when a natural number is divided by 9?

Question illustration
  1. 1
  2. 2
  3. 3
  4. 8
  5. 9

Question 16

At the start and end of his lunch break, Hải sees the classroom clock in a mirror as shown. The starting reflection is on the left and the ending reflection is on the right. How long is Hải’s lunch break?

Question illustration
  1. 3 hours 20 minutes
  2. 3 hours 15 minutes
  3. 2 hours 20 minutes
  4. 4 hours 15 minutes
  5. 3 hours 5 minutes

Question 17

Tí writes every natural number from 4 to 34 on the board: $4;5;6;\ldots;32;33;34$. How many numbers does he write?

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  1. 28
  2. 29
  3. 30
  4. 31
  5. 32

Question 18

How many two-digit numbers have a units digit smaller than their tens digit?

Question illustration
  1. 24
  2. 35
  3. 36
  4. 45
  5. 54

Question 19

A box contains five marbles numbered 1, 4, 7, 10 and 13. Dũng takes out two marbles without looking. How many different sums of their numbers are possible?

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Question 20

Nam multiplies a natural number $A$ by 2020, but he mistakenly writes 220 instead of 2020. His result is 37800 less than the correct result. Find $A$.

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