Talen 778 till 784 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 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 |
| 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 |