| 1) | 838 + 943 = | 2) | 825 − 990 = | 3) | -79 + 894 = |
| 4) | 273 − 106 = | 5) | 551 + 617 = | 6) | 922 + 721 = |
| 1) | 838 + 943 = 1781 | 2) | 825 − 990 = -165 | 3) | -79 + 894 = 815 |
| 4) | 273 − 106 = 167 | 5) | 551 + 617 = 1168 | 6) | 922 + 721 = 1643 |