Subtraction 1's

Front 1

19-1

Back 1

18

Front 2

18-1

Back 2

17

Front 3

17-1

Back 3

16

Front 4

16-1

Back 4

15

Front 5

15-1

Back 5

14

Front 6

14-1

Back 6

13

Front 7

13-1

Back 7

12

Front 8

12-1

Back 8

11

Front 9

11-1

Back 9

10

Front 10

10-1

Back 10

9

Front 11

9-1

Back 11

8

Front 12

8-1

Back 12

7

Front 13

7-1

Back 13

6

Front 14

6-1

Back 14

5

Front 15

5-1

Back 15

4

Front 16

4-1

Back 16

3

Front 17

3-1

Back 17

2

Front 18

2-1

Back 18

1

Front 19

1-1

Back 19

0

Front 20

1-0

Back 20

1