Talen 427 till 433 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 427 | = | CDXXVII | = | 500 − 100 + 10 + 10 + 5 + 1 + 1 |
| 428 | = | CDXXVIII | = | 500 − 100 + 10 + 10 + 5 + 1 + 1 + 1 |
| 429 | = | CDXXIX | = | 500 − 100 + 10 + 10 + 10 − 1 |
| 430 | = | CDXXX | = | 500 − 100 + 10 + 10 + 10 |
| 431 | = | CDXXXI | = | 500 − 100 + 10 + 10 + 10 + 1 |
| 432 | = | CDXXXII | = | 500 − 100 + 10 + 10 + 10 + 1 + 1 |
| 433 | = | CDXXXIII | = | 500 − 100 + 10 + 10 + 10 + 1 + 1 + 1 |