| 1) | -101 − 216 = | 2) | -623 + 264 = | 3) | -326 − 522 = |
| 4) | -635 + 609 = | 5) | -509 + 86 = | 6) | 522 − 408 = |
| 1) | -101 − 216 = -317 | 2) | -623 + 264 = -359 | 3) | -326 − 522 = -848 |
| 4) | -635 + 609 = -26 | 5) | -509 + 86 = -423 | 6) | 522 − 408 = 114 |