| 1) | -229 − 87 = | 2) | 644 + 639 = | 3) | 146 + 290 = |
| 4) | 357 + 532 = | 5) | 706 + 609 = | 6) | -781 + 252 = |
| 1) | -229 − 87 = -316 | 2) | 644 + 639 = 1283 | 3) | 146 + 290 = 436 |
| 4) | 357 + 532 = 889 | 5) | 706 + 609 = 1315 | 6) | -781 + 252 = -529 |