24 in Roman numerals is XXIV, built from XX + IV (XX = 20, IV = 4), which add up to 24. It uses subtractive notation: IV (5 - 1).
How 24 is written in Roman numerals
The number 24 is written XXIV in Roman numerals. Roman numerals use seven letters — I (1), V (5), X (10), L (50), C (100), D (500) and M (1000) — combined from largest to smallest, with subtractive pairs such as IV (4) and IX (9). Need another number? Use the Roman numeral converter or see the 1–100 chart.
Building XXIV step by step — take the largest value that fits, write its symbol, subtract, repeat.
| Write | Value | Remaining before | Remaining after |
|---|
| X | 10 | 24 | 14 |
| X | 10 | 14 | 4 |
| IV | 4 | 4 | 0 |
Where you see XXIV
Regnal and papal names use it the same way — a 24th ruler of a name is styled XXIV, as in Louis XXIV or Pope John XXIV. The 24th Super Bowl was Super Bowl XXIV; the NFL has used Roman numerals for every edition except Super Bowl 50.
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Frequently Asked Questions
What is 24 in Roman numerals?
24 in Roman numerals is XXIV. Reading it left to right gives X (10) + X (10) + IV (4) = 24. The number below it, 23, is written XXIII, and the number above it, 25, is written XXV.
How do you write 24 in Roman numerals?
Write 24 as XXIV, combining X (10) + X (10) + IV (4). Roman numerals are built by taking the largest value that still fits, writing its symbol and subtracting it, which reduces 24 in 3 steps: X leaves 14, X leaves 4, IV leaves 0. Every symbol keeps the same value wherever it stands, so the order is fixed and XXIV is the only standard spelling of 24.
Why is 24 written XXIV rather than XXIIII?
24 is written XXIV because Roman numerals subtract a smaller symbol placed in front of a larger one. Here IV means 5 minus 1. Spelling 24 out additively would give XXIIII, 6 letters against 4, which is why the subtractive form is the standard one.
What is 24 times ten in Roman numerals?
24 times ten is 240, which is CCXL in Roman numerals, not XXIV with a letter added on the end. Roman numerals have no place value, so multiplying by ten respells the whole numeral instead of shifting digits along. Compare XXIV for 24 with CCXL for 240.