Talen 1804 till 1810 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 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 |
| 1808 | = | MDCCCVIII | = | 1000 + 500 + 100 + 100 + 100 + 5 + 1 + 1 + 1 |
| 1809 | = | MDCCCIX | = | 1000 + 500 + 100 + 100 + 100 + 10 − 1 |
| 1810 | = | MDCCCX | = | 1000 + 500 + 100 + 100 + 100 + 10 |