The numbers 403 to 409 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 403 | = | CDIII | = | 500 − 100 + 1 + 1 + 1 |
| 404 | = | CDIV | = | 500 − 100 + 5 − 1 |
| 405 | = | CDV | = | 500 − 100 + 5 |
| 406 | = | CDVI | = | 500 − 100 + 5 + 1 |
| 407 | = | CDVII | = | 500 − 100 + 5 + 1 + 1 |
| 408 | = | CDVIII | = | 500 − 100 + 5 + 1 + 1 + 1 |
| 409 | = | CDIX | = | 500 − 100 + 10 − 1 |