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Facts Within 20: Set 8

Add and subtract from memory.

Answer Key

Add

Write each sum.

1.

3 + 7 = 10

2.

4 + 8 = 12

3.

7 + 6 = 13

4.

9 + 4 = 13

5.

6 + 2 = 8

6.

7 + 3 = 10

Subtract

Write each difference.

7.

12 − 9 = 3

8.

17 − 2 = 15

9.

12 − 2 = 10

10.

16 − 5 = 11

11.

18 − 8 = 10

12.

11 − 5 = 6

Missing numbers

Write the missing number.

13.

6 + 4 = 10

14.

12 − 8 = 4

15.

8 + 10 = 18

16.

17 − 8 = 9