Talen 2815 till 2821 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2815 | = | MMDCCCXV | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 |
| 2816 | = | MMDCCCXVI | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 + 1 |
| 2817 | = | MMDCCCXVII | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 + 1 + 1 |
| 2818 | = | MMDCCCXVIII | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 + 1 + 1 + 1 |
| 2819 | = | MMDCCCXIX | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 10 − 1 |
| 2820 | = | MMDCCCXX | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 10 |
| 2821 | = | MMDCCCXXI | = | 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 10 + 1 |