Talen 3515 till 3521 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 3515 | = | MMMDXV | = | 1000 + 1000 + 1000 + 500 + 10 + 5 |
| 3516 | = | MMMDXVI | = | 1000 + 1000 + 1000 + 500 + 10 + 5 + 1 |
| 3517 | = | MMMDXVII | = | 1000 + 1000 + 1000 + 500 + 10 + 5 + 1 + 1 |
| 3518 | = | MMMDXVIII | = | 1000 + 1000 + 1000 + 500 + 10 + 5 + 1 + 1 + 1 |
| 3519 | = | MMMDXIX | = | 1000 + 1000 + 1000 + 500 + 10 + 10 − 1 |
| 3520 | = | MMMDXX | = | 1000 + 1000 + 1000 + 500 + 10 + 10 |
| 3521 | = | MMMDXXI | = | 1000 + 1000 + 1000 + 500 + 10 + 10 + 1 |