The numbers 420 to 426 in roman numerals
The right column shows how each roman numeral adds up to the total.
| 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 |
| 424 | = | CDXXIV | = | 500 − 100 + 10 + 10 + 5 − 1 |
| 425 | = | CDXXV | = | 500 − 100 + 10 + 10 + 5 |
| 426 | = | CDXXVI | = | 500 − 100 + 10 + 10 + 5 + 1 |