Talen 2405 till 2411 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2405 | = | MMCDV | = | 1000 + 1000 + 500 − 100 + 5 |
| 2406 | = | MMCDVI | = | 1000 + 1000 + 500 − 100 + 5 + 1 |
| 2407 | = | MMCDVII | = | 1000 + 1000 + 500 − 100 + 5 + 1 + 1 |
| 2408 | = | MMCDVIII | = | 1000 + 1000 + 500 − 100 + 5 + 1 + 1 + 1 |
| 2409 | = | MMCDIX | = | 1000 + 1000 + 500 − 100 + 10 − 1 |
| 2410 | = | MMCDX | = | 1000 + 1000 + 500 − 100 + 10 |
| 2411 | = | MMCDXI | = | 1000 + 1000 + 500 − 100 + 10 + 1 |