Talen 1684 till 1690 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1684 | = | MDCLXXXIV | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 5 − 1 |
| 1685 | = | MDCLXXXV | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 5 |
| 1686 | = | MDCLXXXVI | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 5 + 1 |
| 1687 | = | MDCLXXXVII | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 5 + 1 + 1 |
| 1688 | = | MDCLXXXVIII | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 5 + 1 + 1 + 1 |
| 1689 | = | MDCLXXXIX | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 10 − 1 |
| 1690 | = | MDCXC | = | 1000 + 500 + 100 + 100 − 10 |