How to write 21 in Roman numerals
Split 21 into thousands, hundreds, tens and ones, write each part with Roman symbols and join them:
| Symbols | Value | Rule |
|---|---|---|
| X | 10 | add |
| X | 10 | add |
| I | 1 | add |
21 in Roman numerals is written XXI. Here is how it breaks down symbol by symbol.
Split 21 into thousands, hundreds, tens and ones, write each part with Roman symbols and join them:
| Symbols | Value | Rule |
|---|---|---|
| X | 10 | add |
| X | 10 | add |
| I | 1 | add |
| Number | Roman numeral |
|---|---|
| 42 | XLII |
| 210 | CCX |
| 22 | XXII |
| 20 | XX |
21 in Roman numerals is XXI (X + X + I = 10 + 10 + 1 = 21).
XXI is the Roman numeral for 21.