The numbers 24 to 30 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 24 | = | XXIV | = | 10 + 10 + 5 − 1 |
| 25 | = | XXV | = | 10 + 10 + 5 |
| 26 | = | XXVI | = | 10 + 10 + 5 + 1 |
| 27 | = | XXVII | = | 10 + 10 + 5 + 1 + 1 |
| 28 | = | XXVIII | = | 10 + 10 + 5 + 1 + 1 + 1 |
| 29 | = | XXIX | = | 10 + 10 + 10 − 1 |
| 30 | = | XXX | = | 10 + 10 + 10 |