| 1) | -166 − 966 = | 2) | 524 + 409 = | 3) | 919 − 189 = |
| 4) | 497 + 843 = | 5) | 121 − 574 = | 6) | 24 + 731 = |
| 1) | -166 − 966 = -1132 | 2) | 524 + 409 = 933 | 3) | 919 − 189 = 730 |
| 4) | 497 + 843 = 1340 | 5) | 121 − 574 = -453 | 6) | 24 + 731 = 755 |