| 1) | -87 + 855 = | 2) | -91 + 580 = | 3) | -63 + 693 = |
| 4) | -890 + 773 = | 5) | -158 − 278 = | 6) | 840 − 665 = |
| 1) | -87 + 855 = 768 | 2) | -91 + 580 = 489 | 3) | -63 + 693 = 630 |
| 4) | -890 + 773 = -117 | 5) | -158 − 278 = -436 | 6) | 840 − 665 = 175 |