Adding 0 and 1

Front

0+1=

Back

1

Front

0+2=

Back

2

Front

0+3=

Back

3

Front

0+4=

Back

4

Front

0+5=

Back

5

Front

0+6=

Back

6

Front

0+7=

Back

7

Front

0+8=

Back

8

Front

0+9=

Back

9

Front

0+10=

Back

10