Talen 780 till 786 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 780 | = | DCCLXXX | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 |
| 781 | = | DCCLXXXI | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 |
| 782 | = | DCCLXXXII | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 |
| 783 | = | DCCLXXXIII | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 + 1 |
| 784 | = | DCCLXXXIV | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 5 − 1 |
| 785 | = | DCCLXXXV | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 5 |
| 786 | = | DCCLXXXVI | = | 500 + 100 + 100 + 50 + 10 + 10 + 10 + 5 + 1 |