The numbers 21 to 27 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 21 | = | XXI | = | 10 + 10 + 1 |
| 22 | = | XXII | = | 10 + 10 + 1 + 1 |
| 23 | = | XXIII | = | 10 + 10 + 1 + 1 + 1 |
| 24 | = | XXIV | = | 10 + 10 + 5 − 1 |
| 25 | = | XXV | = | 10 + 10 + 5 |
| 26 | = | XXVI | = | 10 + 10 + 5 + 1 |
| 27 | = | XXVII | = | 10 + 10 + 5 + 1 + 1 |