Talen 1280 till 1286 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1280 | = | MCCLXXX | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 |
| 1281 | = | MCCLXXXI | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 + 1 |
| 1282 | = | MCCLXXXII | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 |
| 1283 | = | MCCLXXXIII | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 + 1 |
| 1284 | = | MCCLXXXIV | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 + 5 − 1 |
| 1285 | = | MCCLXXXV | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 + 5 |
| 1286 | = | MCCLXXXVI | = | 1000 + 100 + 100 + 50 + 10 + 10 + 10 + 5 + 1 |