The numbers 12 to 18 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 12 | = | XII | = | 10 + 1 + 1 |
| 13 | = | XIII | = | 10 + 1 + 1 + 1 |
| 14 | = | XIV | = | 10 + 5 − 1 |
| 15 | = | XV | = | 10 + 5 |
| 16 | = | XVI | = | 10 + 5 + 1 |
| 17 | = | XVII | = | 10 + 5 + 1 + 1 |
| 18 | = | XVIII | = | 10 + 5 + 1 + 1 + 1 |