Talen 1801 till 1807 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1801 | = | MDCCCI | = | 1000 + 500 + 100 + 100 + 100 + 1 |
| 1802 | = | MDCCCII | = | 1000 + 500 + 100 + 100 + 100 + 1 + 1 |
| 1803 | = | MDCCCIII | = | 1000 + 500 + 100 + 100 + 100 + 1 + 1 + 1 |
| 1804 | = | MDCCCIV | = | 1000 + 500 + 100 + 100 + 100 + 5 − 1 |
| 1805 | = | MDCCCV | = | 1000 + 500 + 100 + 100 + 100 + 5 |
| 1806 | = | MDCCCVI | = | 1000 + 500 + 100 + 100 + 100 + 5 + 1 |
| 1807 | = | MDCCCVII | = | 1000 + 500 + 100 + 100 + 100 + 5 + 1 + 1 |