Addition and Subtraction within 20

Front

9 + ? = 10

Back

1

Front

10 + 2 = ?

Back

12

Front

17 - ? = 12

Back

5

Front

? + 4 = 5

Back

1

Front

? + 1 = 2

Back

1

Front

5 + ? = 8

Back

3

Front

12 - ? = 7

Back

5

Front

? + 3 = 6

Back

3

Front

15 - ? = 10

Back

5

Front

? + 2 = 4

Back

2