Talen 2778 till 2784 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 2778 | = | MMDCCLXXVIII | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 5 + 1 + 1 + 1 |
| 2779 | = | MMDCCLXXIX | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 10 − 1 |
| 2780 | = | MMDCCLXXX | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 10 |
| 2781 | = | MMDCCLXXXI | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 |
| 2782 | = | MMDCCLXXXII | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 |
| 2783 | = | MMDCCLXXXIII | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 + 1 |
| 2784 | = | MMDCCLXXXIV | = | 1000 + 1000 + 500 + 100 + 100 + 50 + 10 + 10 + 10 + 5 − 1 |