Talen 1428 till 1434 i romerska siffror
I högerkolumnen visas hur varje romersk siffra bidrar till att man hamnar vid rätt tal.
| 1428 | = | MCDXXVIII | = | 1000 + 500 − 100 + 10 + 10 + 5 + 1 + 1 + 1 |
| 1429 | = | MCDXXIX | = | 1000 + 500 − 100 + 10 + 10 + 10 − 1 |
| 1430 | = | MCDXXX | = | 1000 + 500 − 100 + 10 + 10 + 10 |
| 1431 | = | MCDXXXI | = | 1000 + 500 − 100 + 10 + 10 + 10 + 1 |
| 1432 | = | MCDXXXII | = | 1000 + 500 − 100 + 10 + 10 + 10 + 1 + 1 |
| 1433 | = | MCDXXXIII | = | 1000 + 500 − 100 + 10 + 10 + 10 + 1 + 1 + 1 |
| 1434 | = | MCDXXXIV | = | 1000 + 500 − 100 + 10 + 10 + 10 + 5 − 1 |