Tabla del -81
| -81 | X | 1 | = | -81 |
| -81 | X | 2 | = | -162 |
| -81 | X | 3 | = | -243 |
| -81 | X | 4 | = | -324 |
| -81 | X | 5 | = | -405 |
| -81 | X | 6 | = | -486 |
| -81 | X | 7 | = | -567 |
| -81 | X | 8 | = | -648 |
| -81 | X | 9 | = | -729 |
| -81 | X | 10 | = | -810 |
| -81 | X | 1 | = | -81 |
| -81 | X | 2 | = | -162 |
| -81 | X | 3 | = | -243 |
| -81 | X | 4 | = | -324 |
| -81 | X | 5 | = | -405 |
| -81 | X | 6 | = | -486 |
| -81 | X | 7 | = | -567 |
| -81 | X | 8 | = | -648 |
| -81 | X | 9 | = | -729 |
| -81 | X | 10 | = | -810 |