50+4=
54
25+32=
57
13+17=
30
80-20=
60
55-13=
37
75-25
50
3×5=
15
3×7=
21
4×3=
12
6:2=
3
10:2=
5
9:3=
8+4-3
9
10+5-3
13+22+20
55