| 1) | -4 − 927 = | 2) | 525 + 913 = | 3) | -955 + 363 = |
| 4) | -210 + 581 = | 5) | 885 − 386 = | 6) | 31 − 609 = |
| 1) | -4 − 927 = -931 | 2) | 525 + 913 = 1438 | 3) | -955 + 363 = -592 |
| 4) | -210 + 581 = 371 | 5) | 885 − 386 = 499 | 6) | 31 − 609 = -578 |