| 1) | -1 − 241 = | 2) | 15 + 18 = | 3) | -897 + 675 = |
| 4) | -1 − 190 = | 5) | -869 − 205 = | 6) | 186 + 491 = |
| 1) | -1 − 241 = -242 | 2) | 15 + 18 = 33 | 3) | -897 + 675 = -222 |
| 4) | -1 − 190 = -191 | 5) | -869 − 205 = -1074 | 6) | 186 + 491 = 677 |