Talen 1630 till 1636 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1630 | = | MDCXXX | = | 1000 + 500 + 100 + 10 + 10 + 10 |
| 1631 | = | MDCXXXI | = | 1000 + 500 + 100 + 10 + 10 + 10 + 1 |
| 1632 | = | MDCXXXII | = | 1000 + 500 + 100 + 10 + 10 + 10 + 1 + 1 |
| 1633 | = | MDCXXXIII | = | 1000 + 500 + 100 + 10 + 10 + 10 + 1 + 1 + 1 |
| 1634 | = | MDCXXXIV | = | 1000 + 500 + 100 + 10 + 10 + 10 + 5 − 1 |
| 1635 | = | MDCXXXV | = | 1000 + 500 + 100 + 10 + 10 + 10 + 5 |
| 1636 | = | MDCXXXVI | = | 1000 + 500 + 100 + 10 + 10 + 10 + 5 + 1 |