Tabla del 840
| 840 | X | 1 | = | 840 |
| 840 | X | 2 | = | 1680 |
| 840 | X | 3 | = | 2520 |
| 840 | X | 4 | = | 3360 |
| 840 | X | 5 | = | 4200 |
| 840 | X | 6 | = | 5040 |
| 840 | X | 7 | = | 5880 |
| 840 | X | 8 | = | 6720 |
| 840 | X | 9 | = | 7560 |
| 840 | X | 10 | = | 8400 |
| 840 | X | 1 | = | 840 |
| 840 | X | 2 | = | 1680 |
| 840 | X | 3 | = | 2520 |
| 840 | X | 4 | = | 3360 |
| 840 | X | 5 | = | 4200 |
| 840 | X | 6 | = | 5040 |
| 840 | X | 7 | = | 5880 |
| 840 | X | 8 | = | 6720 |
| 840 | X | 9 | = | 7560 |
| 840 | X | 10 | = | 8400 |