27 : 3 + 8 × 7 64 : 8 + 9 × 6 3 × (75 – 45) 2 × (12 + 18) 42 : 6 × 4 32 : 4 × 5

27 : 3 + 8 × 7 = 9 + 56 = 65

64 : 8 + 9 × 6 = 8 + 54 = 62

3 × (75 – 45) = 3 × 30 = 90

2 × (12 + 18) = 2 × 30 = 60

42 : 6 × 4 = 7 × 4 = 28

32 : 4 × 5 = 8 × 5 = 40