Talen 775 till 781 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 775 | = | DCCLXXV | = | 500 + 100 + 100 + 50 + 10 + 10 + 5 |
| 776 | = | DCCLXXVI | = | 500 + 100 + 100 + 50 + 10 + 10 + 5 + 1 |
| 777 | = | DCCLXXVII | = | 500 + 100 + 100 + 50 + 10 + 10 + 5 + 1 + 1 |
| 778 | = | DCCLXXVIII | = | 500 + 100 + 100 + 50 + 10 + 10 + 5 + 1 + 1 + 1 |
| 779 | = | DCCLXXIX | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 − 1 |
| 780 | = | DCCLXXX | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 |
| 781 | = | DCCLXXXI | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 |