The numbers 405 to 411 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 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 |
| 410 | = | CDX | = | 500 − 100 + 10 |
| 411 | = | CDXI | = | 500 − 100 + 10 + 1 |