Talen 2421 till 2427 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2421 | = | MMCDXXI | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 1 |
| 2422 | = | MMCDXXII | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 1 + 1 |
| 2423 | = | MMCDXXIII | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 1 + 1 + 1 |
| 2424 | = | MMCDXXIV | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 5 − 1 |
| 2425 | = | MMCDXXV | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 5 |
| 2426 | = | MMCDXXVI | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 5 + 1 |
| 2427 | = | MMCDXXVII | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 5 + 1 + 1 |