31 in Roman Numerals
How to write the number 31 in Roman numerals, with the full place-value breakdown.
The number 31 in Roman numerals
XXXI
Place-value breakdown
31 = 30 + 1, so XXXI = XXX + I. Roman numerals are written from largest to smallest value, left to right:
| Place | Value | Roman | Rule |
|---|---|---|---|
| Tens | 30 | XXX | Additive rule: XXX = 30 (symbols are simply added) |
| Ones | 1 | I | Additive rule: I = 1 (symbols are simply added) |
About the number 31
The number 31 is written XXXI in Roman numerals.
Looking for the ordinal form — "31st in Roman numerals"? Roman notation makes no distinction between cardinal and ordinal numbers, so "31st" is also written XXXI.
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Roman numeral
XXXI