Talen 1521 till 1527 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1521 | = | MDXXI | = | 1000 + 500 + 10 + 10 + 1 |
| 1522 | = | MDXXII | = | 1000 + 500 + 10 + 10 + 1 + 1 |
| 1523 | = | MDXXIII | = | 1000 + 500 + 10 + 10 + 1 + 1 + 1 |
| 1524 | = | MDXXIV | = | 1000 + 500 + 10 + 10 + 5 − 1 |
| 1525 | = | MDXXV | = | 1000 + 500 + 10 + 10 + 5 |
| 1526 | = | MDXXVI | = | 1000 + 500 + 10 + 10 + 5 + 1 |
| 1527 | = | MDXXVII | = | 1000 + 500 + 10 + 10 + 5 + 1 + 1 |