Talen 2415 till 2421 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2415 | = | MMCDXV | = | 1000 + 1000 + 500 − 100 + 10 + 5 |
| 2416 | = | MMCDXVI | = | 1000 + 1000 + 500 − 100 + 10 + 5 + 1 |
| 2417 | = | MMCDXVII | = | 1000 + 1000 + 500 − 100 + 10 + 5 + 1 + 1 |
| 2418 | = | MMCDXVIII | = | 1000 + 1000 + 500 − 100 + 10 + 5 + 1 + 1 + 1 |
| 2419 | = | MMCDXIX | = | 1000 + 1000 + 500 − 100 + 10 + 10 − 1 |
| 2420 | = | MMCDXX | = | 1000 + 1000 + 500 − 100 + 10 + 10 |
| 2421 | = | MMCDXXI | = | 1000 + 1000 + 500 − 100 + 10 + 10 + 1 |