How much is 12+15?
27
How much is 35+21
56
How much is 49-19
30
How much is 50-30
20
How much is 19+18?
37
How much is 27+49
76
How much is 71-25
46
How much is 100-28
72
How much is (25+38)-19
44
How much is 97-(29+19)
49
