66 : 33 = 2
96 : 48 = 2
81 : 27 = 3
45 : 3 + 14 * 5 = 15 + 70 = 85
11 * 8 − 72 : 2 = 88 − 36 = 52
15 * 4 − 96 : 3 = (10 + 5) * 4 − (90 + 6) : 3 = (40 + 20) − (30 + 2) = 60 − 30 − 2 = 30 − 2 = 28
15 * (92 − 89) : 5 = 15 * 3 : 5 = 45 : 5 = 9
78 : (7 + 6) * 14 = 78 : 13 * 14 = 6 * 14 = 6 * (10 + 4) = 60 + 24 = 84
99 : (5 + 6) + 62 = 99 : 11 + 62 = 9 + 62 = 71