 # Addition and Subtraction Facts to 20 (2)

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

Add  6 + 9

Answer

You should know this by heart, but the number square shows that it is 15. Example 2

Subtract  15 - 9

Answer

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

Add  12 + 5

Answer

You should know that   2 + 5 = 7,

so 12 + 5 = 17

Example 4

Subtract 16 - 12

Answer

You should know that   6 - 2 = 4,

so 16 - 12 = 4 as well.

Add

7 + 8

Subtract

15 - 8

Add

9 + 10

Subtract

20 - 6

Add

4 + 8

Subtract

15 - 5

Add

8 + 8

Subtract

15 - 3

Add

17 + 2

Subtract

13 - 8

Add

3 + 8

Subtract

12 - 8

Add

9 + 5

Subtract

18 - 9

Add

6 + 7

Subtract

12 - 5

Add

5 + 6

Subtract

14 - 7

Add

14 + 6

Subtract

17 - 12

• Question 1

Add

7 + 8

CORRECT ANSWER
15
• Question 2

Subtract

15 - 8

CORRECT ANSWER
7
• Question 3

Add

9 + 10

CORRECT ANSWER
19
• Question 4

Subtract

20 - 6

CORRECT ANSWER
14
• Question 5

Add

4 + 8

CORRECT ANSWER
12
• Question 6

Subtract

15 - 5

CORRECT ANSWER
10
• Question 7

Add

8 + 8

CORRECT ANSWER
16
• Question 8

Subtract

15 - 3

CORRECT ANSWER
12
• Question 9

Add

17 + 2

CORRECT ANSWER
19
• Question 10

Subtract

13 - 8

CORRECT ANSWER
5
• Question 11

Add

3 + 8

CORRECT ANSWER
11
• Question 12

Subtract

12 - 8

CORRECT ANSWER
4
• Question 13

Add

9 + 5

CORRECT ANSWER
14
• Question 14

Subtract

18 - 9

CORRECT ANSWER
9
• Question 15

Add

6 + 7

CORRECT ANSWER
13
• Question 16

Subtract

12 - 5

CORRECT ANSWER
7
• Question 17

Add

5 + 6

CORRECT ANSWER
11
• Question 18

Subtract

14 - 7

CORRECT ANSWER
7
• Question 19

Add

14 + 6

CORRECT ANSWER
20
• Question 20

Subtract

17 - 12

CORRECT ANSWER
5
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