# Addition and Subtraction Facts to 20 (1)

In this worksheet, students must know by heart their addition and subtraction number bonds to 20. No explanations are given.

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Use Addition/Subtraction Facts to 100

Difficulty level:

### QUESTION 1 of 10

Look at this number square, which shows all the bonds you should know by heart up to 20.

Example 1

You should know this by heart, but the number square shows that it is 15.

Example 2

Subtract  15 - 9

You should know this by heart, but the number square shows that it is 6.

When you subtract, the starting number is inside the square.

Example 3

You should know that   2 + 5 = 7,

so 12 + 5 = 17

Example 4

Subtract 16 - 12

You should know that   6 - 2 = 4,

so 16 - 12 = 4 as well.

6 + 8

Subtract

14 - 8

6 + 10

Subtract

14 - 6

3 + 8

Subtract

14 - 5

5 + 8

Subtract

14 - 3

16 + 2

Subtract

12 - 8

2 + 8

Subtract

15 - 8

9 + 10

Subtract

16 - 6

3 + 7

Subtract

10 - 5

5 + 12

Subtract

14 - 1

13 + 6

Subtract

16 - 8

• Question 1

6 + 8

14
• Question 2

Subtract

14 - 8

6
• Question 3

6 + 10

16
• Question 4

Subtract

14 - 6

8
• Question 5

3 + 8

11
• Question 6

Subtract

14 - 5

9
• Question 7

5 + 8

13
• Question 8

Subtract

14 - 3

11
• Question 9

16 + 2

18
• Question 10

Subtract

12 - 8

4
• Question 11

2 + 8

10
• Question 12

Subtract

15 - 8

7
• Question 13

9 + 10

19
• Question 14

Subtract

16 - 6

10
• Question 15

3 + 7

10
• Question 16

Subtract

10 - 5

5
• Question 17

5 + 12

17
• Question 18

Subtract

14 - 1

13
• Question 19

13 + 6

19
• Question 20

Subtract

16 - 8

8
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