Addition within 20

Front

10 + 10 =

Back

20, twenty

Front

5 + 8 =

Back

13, thirteen

Front

3 + 3 + 1 =

Back

7, seven

Front

6 + 1 =

Back

7, seven

Front

1 + 6 =

Back

7, seven

Front

2 + 2 =

Back

4, four

Front

4 + 5 =

Back

9, nine

Front

7 + 2 =

Back

9, nine

Front

8 + 1 =

Back

9, nine

Front

9 + 0 =

Back

9, nine