Talen 2663 till 2669 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 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 |
| 2667 | = | MMDCLXVII | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 5 + 1 + 1 |
| 2668 | = | MMDCLXVIII | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 5 + 1 + 1 + 1 |
| 2669 | = | MMDCLXIX | = | 1000 + 1000 + 500 + 100 + 50 + 10 + 10 − 1 |