The numbers 315 to 321 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 315 | = | CCCXV | = | 100 + 100 + 100 + 10 + 5 |
| 316 | = | CCCXVI | = | 100 + 100 + 100 + 10 + 5 + 1 |
| 317 | = | CCCXVII | = | 100 + 100 + 100 + 10 + 5 + 1 + 1 |
| 318 | = | CCCXVIII | = | 100 + 100 + 100 + 10 + 5 + 1 + 1 + 1 |
| 319 | = | CCCXIX | = | 100 + 100 + 100 + 10 + 10 − 1 |
| 320 | = | CCCXX | = | 100 + 100 + 100 + 10 + 10 |
| 321 | = | CCCXXI | = | 100 + 100 + 100 + 10 + 10 + 1 |