13-1=

18-8=

3+13=

14-8=

11-11=

17-3=

16-6=

13-1=

12-2=

14+2=

9+3=

2+15=

16-2=

7+10=

18-1=

15-3=

14+6=

19+0=

16-3=

17-12=

9+5=

12+6=

13-3=

13+0=

17-1=

11+4=

19-7=

12-5=

13-5=

15+5=

20-1=

20-5=

15-12=

17+2=

9+6=

14-9=

18-10=

14+4=

13+1=

19+1=

13+5=

12-0=

15+5=

4+16=

12-0=

6+5=

20-12=

5+12=

13+5=

14+1=