Talen 1647 till 1653 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1647 | = | MDCXLVII | = | 1000 + 500 + 100 + 50 − 10 + 5 + 1 + 1 |
| 1648 | = | MDCXLVIII | = | 1000 + 500 + 100 + 50 − 10 + 5 + 1 + 1 + 1 |
| 1649 | = | MDCXLIX | = | 1000 + 500 + 100 + 50 − 10 + 10 − 1 |
| 1650 | = | MDCL | = | 1000 + 500 + 100 + 50 |
| 1651 | = | MDCLI | = | 1000 + 500 + 100 + 50 + 1 |
| 1652 | = | MDCLII | = | 1000 + 500 + 100 + 50 + 1 + 1 |
| 1653 | = | MDCLIII | = | 1000 + 500 + 100 + 50 + 1 + 1 + 1 |