| 1) | 279 + 766 = | 2) | 322 − 891 = | 3) | -304 + 551 = |
| 4) | 564 − 779 = | 5) | -564 − 829 = | 6) | -115 + 565 = |
| 1) | 279 + 766 = 1045 | 2) | 322 − 891 = -569 | 3) | -304 + 551 = 247 |
| 4) | 564 − 779 = -215 | 5) | -564 − 829 = -1393 | 6) | -115 + 565 = 450 |