The numbers 417 to 423 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 417 | = | CDXVII | = | 500 − 100 + 10 + 5 + 1 + 1 |
| 418 | = | CDXVIII | = | 500 − 100 + 10 + 5 + 1 + 1 + 1 |
| 419 | = | CDXIX | = | 500 − 100 + 10 + 10 − 1 |
| 420 | = | CDXX | = | 500 − 100 + 10 + 10 |
| 421 | = | CDXXI | = | 500 − 100 + 10 + 10 + 1 |
| 422 | = | CDXXII | = | 500 − 100 + 10 + 10 + 1 + 1 |
| 423 | = | CDXXIII | = | 500 − 100 + 10 + 10 + 1 + 1 + 1 |