Talen 2645 till 2651 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2645 | = | MMDCXLV | = | 1000 + 1000 + 500 + 100 + 50 − 10 + 5 |
| 2646 | = | MMDCXLVI | = | 1000 + 1000 + 500 + 100 + 50 − 10 + 5 + 1 |
| 2647 | = | MMDCXLVII | = | 1000 + 1000 + 500 + 100 + 50 − 10 + 5 + 1 + 1 |
| 2648 | = | MMDCXLVIII | = | 1000 + 1000 + 500 + 100 + 50 − 10 + 5 + 1 + 1 + 1 |
| 2649 | = | MMDCXLIX | = | 1000 + 1000 + 500 + 100 + 50 − 10 + 10 − 1 |
| 2650 | = | MMDCL | = | 1000 + 1000 + 500 + 100 + 50 |
| 2651 | = | MMDCLI | = | 1000 + 1000 + 500 + 100 + 50 + 1 |