List of Roman numerals / numbers from 1 to 20.
| Number | Roman Numeral |
Calculation |
|---|---|---|
| 0 | not defined |
|
| 1 | I | 1 |
| 2 | II | 1+1 |
| 3 | III | 1+1+1 |
| 4 | IV | 5-1 |
| 5 | V | 5 |
| 6 | VI | 5+1 |
| 7 | VII | 5+1+1 |
| 8 | VIII | 5+1+1+1 |
| 9 | IX | 10-1 |
| 10 | X | 10 |
| 11 | XI | 10+1 |
| 12 | XII | 10+1+1 |
| 13 | XIII | 10+1+1+1 |
| 14 | XIV | 10-1+5 |
| 15 | XV | 10+5 |
| 16 | XVI | 10+5+1 |
| 17 | XVII | 10+5+1+1 |
| 18 | XVIII | 10+5+1+1+1 |
| 19 | XIX | 10-1+10 |
| 20 | XX | 10+10 |
