| 21 | x | 1 | = | 21 |
| 21 | x | 2 | = | 42 |
| 21 | x | 3 | = | 63 |
| 21 | x | 4 | = | 84 |
| 21 | x | 5 | = | 105 |
| 21 | x | 6 | = | 126 |
| 21 | x | 7 | = | 147 |
| 21 | x | 8 | = | 168 |
| 21 | x | 9 | = | 189 |
| 21 | x | 10 | = | 210 |
| 21 | x | 11 | = | 231 |
| 21 | x | 12 | = | 252 |
| 21 | x | 13 | = | 273 |
| 21 | x | 14 | = | 294 |
| 21 | x | 15 | = | 315 |
| 21 | x | 16 | = | 336 |
| 21 | x | 17 | = | 357 |
| 21 | x | 18 | = | 378 |
| 21 | x | 19 | = | 399 |
| 21 | x | 20 | = | 420 |