1) 17 + 7 = 24
2) 24 + 9 = 33
3) 47 - 9 = 38
4) 41 - 3 = 38
5) 60 - 24 = 36
6) 70 - 53 = 17
7) 90 - (32 + 8) = 90 - 40 = 50
8) 70 + (60 - 40) = 70 + 20 = 90