The numbers 309 to 315 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 309 | = | CCCIX | = | 100 + 100 + 100 + 10 − 1 |
| 310 | = | CCCX | = | 100 + 100 + 100 + 10 |
| 311 | = | CCCXI | = | 100 + 100 + 100 + 10 + 1 |
| 312 | = | CCCXII | = | 100 + 100 + 100 + 10 + 1 + 1 |
| 313 | = | CCCXIII | = | 100 + 100 + 100 + 10 + 1 + 1 + 1 |
| 314 | = | CCCXIV | = | 100 + 100 + 100 + 10 + 5 − 1 |
| 315 | = | CCCXV | = | 100 + 100 + 100 + 10 + 5 |