Talen 485 till 491 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 485 | = | CDLXXXV | = | 500 − 100 + 50 + 10 + 10 + 10 + 5 |
| 486 | = | CDLXXXVI | = | 500 − 100 + 50 + 10 + 10 + 10 + 5 + 1 |
| 487 | = | CDLXXXVII | = | 500 − 100 + 50 + 10 + 10 + 10 + 5 + 1 + 1 |
| 488 | = | CDLXXXVIII | = | 500 − 100 + 50 + 10 + 10 + 10 + 5 + 1 + 1 + 1 |
| 489 | = | CDLXXXIX | = | 500 − 100 + 50 + 10 + 10 + 10 + 10 − 1 |
| 490 | = | CDXC | = | 500 − 100 + 100 − 10 |
| 491 | = | CDXCI | = | 500 − 100 + 100 − 10 + 1 |