| 1) | 518 − 959 = | 2) | 979 − 965 = | 3) | 146 + 809 = |
| 4) | 200 + 333 = | 5) | 992 + 359 = | 6) | -872 − 926 = |
| 1) | 518 − 959 = -441 | 2) | 979 − 965 = 14 | 3) | 146 + 809 = 955 |
| 4) | 200 + 333 = 533 | 5) | 992 + 359 = 1351 | 6) | -872 − 926 = -1798 |