Solution:
- 18 * 7 = 126
- 17 * 8 = 136
- 19 * 6 = 114
- 106 * 7 - 107 * 6 = 742 - 642 = 100
- 203 * 4 - 204 * 3 = 812 - 612 = 200
- 150 * 6 - 160 * 5 = 900 - 800 = 100
- 180 - 120 * 5 : 6 = 180 - 600 : 6 = 180 - 100 = 80
- 210 - 140 * 5 : 7 = 210 - 700 : 7 = 210 - 100 = 110
- 240 - 160 * 5 : 8 = 240 - 800 : 8 = 240 - 100 = 140
Answer: 126, 136, 114, 100, 200, 100, 80, 110, 140