Решение:
- 483 + 257 = 740
- 621 + 199 = 820
- 356 + 207 = 563
- 820 - 164 = 656
- 9 * 9 - 59 = 81 - 59 = 22
- 408 - 262 = 146
- 15 * 8 : 3 = 120 : 3 = 40
- 30 * 8 : 2 = 240 : 2 = 120
- 60 * 6 : 3 = 360 : 3 = 120
- 6 * 16 : 8 - 2 = 96 : 8 - 2 = 12 - 2 = 10
- 6 * 16 : (8 - 2) = 96 : 6 = 16
- 4 * 15 : 5 * 4 = 60 : 5 * 4 = 12 * 4 = 48
Ответ: 740, 820, 563, 656, 22, 146, 40, 120, 120, 10, 16, 48.