Talen 278 till 284 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 278 | = | CCLXXVIII | = | 100 + 100 + 50 + 10 + 10 + 5 + 1 + 1 + 1 |
| 279 | = | CCLXXIX | = | 100 + 100 + 50 + 10 + 10 + 10 − 1 |
| 280 | = | CCLXXX | = | 100 + 100 + 50 + 10 + 10 + 10 |
| 281 | = | CCLXXXI | = | 100 + 100 + 50 + 10 + 10 + 10 + 1 |
| 282 | = | CCLXXXII | = | 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 |
| 283 | = | CCLXXXIII | = | 100 + 100 + 50 + 10 + 10 + 10 + 1 + 1 + 1 |
| 284 | = | CCLXXXIV | = | 100 + 100 + 50 + 10 + 10 + 10 + 5 − 1 |