Talen 3639 till 3645 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 3639 | = | MMMDCXXXIX | = | 1000 + 1000 + 1000 + 500 + 100 + 10 + 10 + 10 + 10 − 1 |
| 3640 | = | MMMDCXL | = | 1000 + 1000 + 1000 + 500 + 100 + 50 − 10 |
| 3641 | = | MMMDCXLI | = | 1000 + 1000 + 1000 + 500 + 100 + 50 − 10 + 1 |
| 3642 | = | MMMDCXLII | = | 1000 + 1000 + 1000 + 500 + 100 + 50 − 10 + 1 + 1 |
| 3643 | = | MMMDCXLIII | = | 1000 + 1000 + 1000 + 500 + 100 + 50 − 10 + 1 + 1 + 1 |
| 3644 | = | MMMDCXLIV | = | 1000 + 1000 + 1000 + 500 + 100 + 50 − 10 + 5 − 1 |
| 3645 | = | MMMDCXLV | = | 1000 + 1000 + 1000 + 500 + 100 + 50 − 10 + 5 |