12 + 33 = 45

35 + 4 = 39

65 + 12 = 77

72 + 11 = 83

21 + 7 = 28

54 + 24 = 78

31 + 24 = 55

34 + 32 = 66

48 + 20 = 68

76 + 23 = 99

27 + 21 = 48

61 + 14 = 75

62 + 25 = 87

71 + 17 = 88

17 + 40 = 57

56 + 31 = 87

55 – 33 = 22

39 – 6 = 33

90 – 20 = 70

79 – 34 = 45

38 – 10 = 28

75 – 23 = 52

76 – 23 = 53

84 – 21 = 63

96 – 14 = 82

92 – 20 = 72

58 – 14 = 44

89 – 63 = 26

77 – 16 = 61

80 – 60 = 20

79 – 42 = 37

78 – 21 = 57