| 1) | 370 − 513 = | 2) | 679 + 358 = | 3) | -124 − 548 = |
| 4) | 753 − 551 = | 5) | -312 − 981 = | 6) | 359 + 505 = |
| 1) | 370 − 513 = -143 | 2) | 679 + 358 = 1037 | 3) | -124 − 548 = -672 |
| 4) | 753 − 551 = 202 | 5) | -312 − 981 = -1293 | 6) | 359 + 505 = 864 |