Single Number Addition

Front 1

4+0

Back 1

0

Front 2

4+1

Back 2

5

Front 3

4+2

Back 3

6

Front 4

4+3

Back 4

7

Front 5

4+4

Back 5

8

Front 6

4+5

Back 6

9

Front 7

4+6

Back 7

10

Front 8

4+7

Back 8

11

Front 9

4+8

Back 9

12

Front 10

4+9

Back 10

13

Front 11

0+4

Back 11

4

Front 12

1+4

Back 12

5

Front 13

2+4

Back 13

6

Front 14

3+4

Back 14

7

Front 15

4+4

Back 15

8

Front 16

5+4

Back 16

9

Front 17

6+4

Back 17

10

Front 18

7+4

Back 18

11

Front 19

8+4

Back 19

12

Front 20

9+4

Back 20

13

Front 21

10+4

Back 21

14

Front 22

4+10

Back 22

14