Talen 2660 till 2666 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2660 | = | MMDCLX | = | 1000 + 1000 + 500 + 100 + 50 + 10 |
| 2661 | = | MMDCLXI | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 1 |
| 2662 | = | MMDCLXII | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 1 + 1 |
| 2663 | = | MMDCLXIII | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 1 + 1 + 1 |
| 2664 | = | MMDCLXIV | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 5 − 1 |
| 2665 | = | MMDCLXV | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 5 |
| 2666 | = | MMDCLXVI | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 5 + 1 |