Addition (Fours)

Front 1

4 + 0 =

Back 1

4

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

4 + 10 =

Back 11

14

Front 12

4 + 11 =

Back 12

15

Front 13

4 + 12 =

Back 13

16