1) 3 * 6 - 6 = 18 - 6 = 12
2) (47 – 7) + 16 = 40 + 16 = 56
5 * 4 + 20 = 20 + 20 = 40
84 + (30 – 30) = 84 + 0 = 84
8 * 2 + 24 = 16 + 24 = 40
100 - 20 - 20 - 20 = 80 - 20 - 20 = 60 - 20 = 40