| 1) | 515 − 139 = | 2) | 387 + 490 = | 3) | -527 + 981 = |
| 4) | 504 − 253 = | 5) | -695 + 999 = | 6) | 599 − 459 = |
| 1) | 515 − 139 = 376 | 2) | 387 + 490 = 877 | 3) | -527 + 981 = 454 |
| 4) | 504 − 253 = 251 | 5) | -695 + 999 = 304 | 6) | 599 − 459 = 140 |