adding and subtracting within 10 (equations)

Front

10 - 10 = ?

Back

0

Front

1 + 9 = ?

Back

10

Front

8 + 2 = ?

Back

10

Front

1 + 8 = ?

Back

9

Front

5 + 5 = ?

Back

10

Front

2 + 3 = ?

Back

5

Front

4 + 4 = ?

Back

8

Front

3 + 6 = ?

Back

9

Front

7 - 3 = ?

Back

4

Front

9 - 1 = ?

Back

8