Talen 1657 till 1663 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1657 | = | MDCLVII | = | 1000 + 500 + 100 + 50 + 5 + 1 + 1 |
| 1658 | = | MDCLVIII | = | 1000 + 500 + 100 + 50 + 5 + 1 + 1 + 1 |
| 1659 | = | MDCLIX | = | 1000 + 500 + 100 + 50 + 10 − 1 |
| 1660 | = | MDCLX | = | 1000 + 500 + 100 + 50 + 10 |
| 1661 | = | MDCLXI | = | 1000 + 500 + 100 + 50 + 10 + 1 |
| 1662 | = | MDCLXII | = | 1000 + 500 + 100 + 50 + 10 + 1 + 1 |
| 1663 | = | MDCLXIII | = | 1000 + 500 + 100 + 50 + 10 + 1 + 1 + 1 |