Talen 1680 till 1686 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1680 | = | MDCLXXX | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 |
| 1681 | = | MDCLXXXI | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 1 |
| 1682 | = | MDCLXXXII | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 1 + 1 |
| 1683 | = | MDCLXXXIII | = | 1000 + 500 + 100 + 50 + 10 + 10 + 10 + 1 + 1 + 1 |
| 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 |