# Number Bonds: Adding up to 20 (4)

In this worksheet, students must simply know their addition number bonds up to 20. No explanations are given.

Key stage:  KS 1

Curriculum topic:   Number: Addition and Subtraction

Curriculum subtopic:   Add and Subtract to 20

Difficulty level:

### QUESTION 1 of 10

In this worksheet, you must know your adding number bonds up to 20.

And that means knowing them off by heart.

Example

4 + 8

12

Remember

4 + 8 is the same as 8 + 4.

10 + 6 = 16 and 10 + 7 = 17 and so on.

0 + 5 = 5 and 0 + 19 = 19 and so on.

7 + 7 is twice 7 so 7 + 7 = 14.

2 + 15

5 + 13

8 + 8

4 + 6

0 + 17

11 + 5

3 + 3

9 + 2

3 + 13

12 + 8

• Question 1

2 + 15

17
• Question 2

5 + 13

18
• Question 3

8 + 8

16
• Question 4

4 + 6

10
• Question 5

0 + 17

17
• Question 6

11 + 5

16
• Question 7

3 + 3

6
• Question 8

9 + 2

11
• Question 9

3 + 13

16
• Question 10

12 + 8

20
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