multiplication
10x3
what is 30
10+5
what is 15
10-7
what is 3
9x4
what is 36
19+7
what is 26
21-9
what is 12
8x7
what is 56
37+16
what is 53
54-17
what is 37
15x6
what is 90
56+21
what is 77
73-36
what is 37
7x17
what is 112
93+35
what is 128
179-81
what is 98