| 1) | -771 + 629 = | 2) | 798 + 225 = | 3) | 304 − 143 = |
| 4) | 205 + 147 = | 5) | 575 − 453 = | 6) | 568 − 868 = |
| 1) | -771 + 629 = -142 | 2) | 798 + 225 = 1023 | 3) | 304 − 143 = 161 |
| 4) | 205 + 147 = 352 | 5) | 575 − 453 = 122 | 6) | 568 − 868 = -300 |