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If you know that 22 + 8 = 30 it will help you to solve 30 - ? = 22.

Year 2 Calculation - Missing Number Problems

Find the missing number in quick sums. Use make-10, number bonds, and inverse checks to fill the box and solve addition or subtraction neatly in your head.

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Fascinating Fact:

Make 10: □ + 8 = 14. Think 8 needs 2 to make 10, then 4 more, so 6. The box is 6.

In KS1 Maths, Year 2 pupils solve missing number problems by using number bonds to 10 and 20, counting on or back, and inverse checks. Boxes stand for numbers we need to find.

Key Terms

Missing number: A box or blank that stands for a number you must work out.
Number bond: Two numbers that make a target total, like 6 + 4 = 10 or 8 + 12 = 20.
Inverse: An opposite operation used to check, for example addition with subtraction.

Warm up with a quick challenge: try the Numeracy Game before you start the quiz.

Frequently Asked Questions (Click to see answers)

How do I solve □ + 8 = 14 in Year 2?

Use number bonds. 8 needs 2 to make 10, then 4 more to reach 14. 2 + 4 = 6, so the missing number is 6.

What if the box is in subtraction, like 14 − □ = 8?

Think about the difference. Count back from 14 to 8: 6 steps. So the missing number is 6.

How can I check my answer to a missing number sum?

Use the inverse. If □ + 8 = 14 gives 6, check 14 − 8 = 6 or 6 + 8 = 14. Both confirm the answer.

Try These Related Quizzes

Question 1

You could use 45 + 55 = 100 to help you solve:

100 - 5

40 + 500

100 - 20

100 - 55

If 45 + 55 = 100, you could solve 100 - 55 = 45

Question 2

What is the missing number:
12 + ? = 20

12 + 8 is a number pair, or bond, to 20

Question 3

If 95 + 5 = 100 is true, which of the following is not true?

95 + 95 = 100

5 + 95 = 100

100 - 95 = 5

100 - 5 = 95

The numbers in each calculation should always be 5, 95 and 100

Question 4

If 15 + 85 = 100 is true, which of the following is not true?

100 - 15 = 85

100 - 85 = 100

100 - 85 = 15

85 + 15 = 100

100 - 85 = 15, not 100

Question 5

Which fact would help you solve:
10 - ? = 4

8 + 2 = 10

10 + 4 = 14

4 + 6 = 10

10 + 6 = 16

If 4 + 6 = 10, then 10 - 6 = 4

Question 6

What is the missing number:
20 - ? = 7

If 7 + 13 = 20, then 20 - 13 = 7

Question 7

Which number is missing:
100 - ? = 20

20 + 80 = 100 so 100 - 80 = 20

Question 8

If 16 + 84 = 100 is true, which of the following is not true?

84 + 16 = 100

100 - 84 = 16

16 + 16 = 84

100 - 16 = 84

16 + 16 = 32, not 100

Question 9

You could use 100 - 25 = 75 to help you solve:

25 + 75

75 - 25

75 - 100

25 - 100

If you know that 100 - 25 = 75, then you could solve 25 + 75 = 100

Question 10

Which number is missing:
? + 5 = 20

20 - 5 = 15, so 15 + 5 = 20

Author: Angela Smith (Primary School Teacher & KS1 Quiz Writer)

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