| 1) | 809 + 611 = | 2) | 126 + 644 = | 3) | 453 − 823 = |
| 4) | 34 − 243 = | 5) | 150 + 525 = | 6) | -238 + 213 = |
| 1) | 809 + 611 = 1420 | 2) | 126 + 644 = 770 | 3) | 453 − 823 = -370 |
| 4) | 34 − 243 = -209 | 5) | 150 + 525 = 675 | 6) | -238 + 213 = -25 |