6. 17 +7 24+9 47-9 41-3 60-24 70-53 90- (32+8) 70+ (60-40)

17 + 7 = 24

24 + 9 = 33

47 - 9 = 38

41 - 3 = 38

60 - 24 = 36

70 - 53 = 17

90 - (32+8) = 90 - 40 = 50

70 + (60-40) = 70 + 20 = 90