| 1) | 821 − 763 = | 2) | -299 + 390 = | 3) | 894 + 607 = |
| 4) | 614 − 59 = | 5) | -639 − 680 = | 6) | -611 + 886 = |
| 1) | 821 − 763 = 58 | 2) | -299 + 390 = 91 | 3) | 894 + 607 = 1501 |
| 4) | 614 − 59 = 555 | 5) | -639 − 680 = -1319 | 6) | -611 + 886 = 275 |