15-79 45-550 57-505
4+813 7+6076 12-57
3+8=
11-3=
12-6=
6+9=
12-4=
13-5=
16-8=
7+9=
16-9=
10+8=
12+5=
11-4=
15-6=
9+5=
13-7=
46+23= 67-20= 73-23=
42-12= 45-25= 93-40=
83-3= 36+12= 45+30=