Talen 1266 till 1272 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1266 | = | MCCLXVI | = | 1000 + 100 + 100 + 50 + 10 + 5 + 1 |
| 1267 | = | MCCLXVII | = | 1000 + 100 + 100 + 50 + 10 + 5 + 1 + 1 |
| 1268 | = | MCCLXVIII | = | 1000 + 100 + 100 + 50 + 10 + 5 + 1 + 1 + 1 |
| 1269 | = | MCCLXIX | = | 1000 + 100 + 100 + 50 + 10 + 10 − 1 |
| 1270 | = | MCCLXX | = | 1000 + 100 + 100 + 50 + 10 + 10 |
| 1271 | = | MCCLXXI | = | 1000 + 100 + 100 + 50 + 10 + 10 + 1 |
| 1272 | = | MCCLXXII | = | 1000 + 100 + 100 + 50 + 10 + 10 + 1 + 1 |