| 1) | 376 − 621 = | 2) | -275 + 613 = | 3) | 444 − 906 = |
| 4) | 810 − 178 = | 5) | 575 + 279 = | 6) | -633 + 335 = |
| 1) | 376 − 621 = -245 | 2) | -275 + 613 = 338 | 3) | 444 − 906 = -462 |
| 4) | 810 − 178 = 632 | 5) | 575 + 279 = 854 | 6) | -633 + 335 = -298 |