24+5= 36+9= 15-7= 58-3=
40+60= 90-30= 74-50= 66+30=
10+20+30= 80-20-50= 5+5+5= 27-8+6=
17+(45-5)= 72+(16+4)= 39-(13-4)= 84-(24-20)=
33+440 2415+7 9+8098
12+6=
14+3=
6+11=
7+13=
9+10=
16+3=
15+2=
4+13=
8+12=
13+6=
15+4=
16+4=
9+8=
10-3=
15+3=