18 - 1=

4 + 5 =

9 - 7 =

6 + 7=

5 + 9 =

7 + 8 =

9 + 1=

12 + 5=

8 + 4=

3 +12 =

14 - 2=

13

14

17

15

17

12

15

10

12

19 - 8 =

11