Talen 3815 till 3821 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 3815 | = | MMMDCCCXV | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 |
| 3816 | = | MMMDCCCXVI | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 + 1 |
| 3817 | = | MMMDCCCXVII | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 + 1 + 1 |
| 3818 | = | MMMDCCCXVIII | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 5 + 1 + 1 + 1 |
| 3819 | = | MMMDCCCXIX | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 10 − 1 |
| 3820 | = | MMMDCCCXX | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 10 |
| 3821 | = | MMMDCCCXXI | = | 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 10 + 10 + 1 |