| 1) | 420 − 868 = | 2) | 77 + 385 = | 3) | -585 + 252 = |
| 4) | 659 − 906 = | 5) | 881 + 563 = | 6) | 678 + 853 = |
| 1) | 420 − 868 = -448 | 2) | 77 + 385 = 462 | 3) | -585 + 252 = -333 |
| 4) | 659 − 906 = -247 | 5) | 881 + 563 = 1444 | 6) | 678 + 853 = 1531 |