*This quiz addresses the requirements of the National Curriculum KS1 Maths and Numeracy for children aged 5 and 6 in year 1. Specifically this quiz is aimed at the section dealing with working out missing numbers in number sentences. *

Finding the missing number in a number sentence such as 7 = ? - 9 will require an understanding of the symbols used and what they mean, as well as an understanding of how subtraction and addition work and how they are related to each other. To find the missing number in the above sentence, for example, understanding that '=' means 'is the same as' should help to work out that 16 - 9 gives an answer of 7.

Question 1

Which number is missing:

20 = 17 + ?

20 = 17 + ?

6

5

4

3

Knowing number bonds to 20 might be helpful here!

Question 2

Which number is missing:

8 = ? + 5

8 = ? + 5

2

3

5

8

Working out which two numbers add together to make 8 is helpful here

Question 3

Which number is missing:

5 = 19 - ?

5 = 19 - ?

14

13

12

11

5 is equal to 19 - 14

Question 4

Which number is missing:

15 - 11 = 2 + ?

15 - 11 = 2 + ?

2

3

4

5

Make sure both calculations give the same answer

Question 5

Which number is missing:

3 + 4 = 10 - ?

3 + 4 = 10 - ?

4

3

7

10

This question is all about balancing both sides evenly

Question 6

Which number is missing:

20 - ? = 5 + 5 + 5 + 5

20 - ? = 5 + 5 + 5 + 5

1

0

2

20

5 + 5 + 5 + 5 = 20, so nothing needs to be subtracted from the other side

Question 7

Which number is missing:

8 - ? = 2

8 - ? = 2

2

8

4

6

Using fingers might be useful

Question 8

Which number is missing:

20 - 4 = 12 + ?

20 - 4 = 12 + ?

4

6

12

20

Balancing the two number sentences to give the same answer is the key here

Question 9

Which number is missing:

2 + 3 + 6 = 19 - ?

2 + 3 + 6 = 19 - ?

19

9

11

8

19 - 8 gives 11, which is what the other numbers add up to

Question 10

Which number is missing:

18 = 4 + 6 + ?

18 = 4 + 6 + ?

6

17

8

15

8 must be added to 4 and 6 to get 18

The next step is:

If you are a student, sign up for an individual subscription.

If you are a teacher, sign up for a free 30-day trial. (We will require your email address at the school for verification purposes.)