Talen 2515 till 2521 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2515 | = | MMDXV | = | 1000 + 1000 + 500 + 10 + 5 |
| 2516 | = | MMDXVI | = | 1000 + 1000 + 500 + 10 + 5 + 1 |
| 2517 | = | MMDXVII | = | 1000 + 1000 + 500 + 10 + 5 + 1 + 1 |
| 2518 | = | MMDXVIII | = | 1000 + 1000 + 500 + 10 + 5 + 1 + 1 + 1 |
| 2519 | = | MMDXIX | = | 1000 + 1000 + 500 + 10 + 10 − 1 |
| 2520 | = | MMDXX | = | 1000 + 1000 + 500 + 10 + 10 |
| 2521 | = | MMDXXI | = | 1000 + 1000 + 500 + 10 + 10 + 1 |