24 in Roman numerals at a glance
- Roman numeral
- XXIV
- Lowercase
- xxiv
- Letters
- 4
- Parts
- X · X · IV
- Subtractive pairs
- IV
- In words
- twenty-four
- Latin name
- viginti quattuor
How XXIV is built
Roman numerals are written one decimal place at a time, from the largest place to the smallest. Converting each digit of 24 separately and joining the pieces gives XXIV:
| Place | Digit | Value | Numeral |
|---|---|---|---|
| Tens | 2 | 20 | XX |
| Ones | 4 | 4 | IV |
Reading it back, left to right:
- X = 10 → running total 10
- X = 10 → running total 20
- IV = 4 (V minus I) → running total 24
The rules XXIV follows
- Largest to smallest. XXIV uses the symbols X, I and V (4 characters in all), and the values never increase from left to right except inside a subtractive pair.
- Subtraction. IV (4) is a subtractive pair: a smaller symbol in front of a larger one is taken away from it. Only six pairs are allowed — IV, IX, XL, XC, CD and CM — and XXIV uses one of them.
- Repetition. XX repeats X two times. I, X, C and M may repeat up to three times in a row; V, L and D never repeat.
Common mistakes when writing 24
- XXIIII — wrong because standard numerals never repeat a symbol four times; 4 is written IV. The correct form is XXIV.
Where you will see XXIV
- The U.S. Constitution. Amendments are often cited in Roman numerals: Amendment XXIV bans poll taxes in federal elections (ratified in 1964).
- The modern Summer Games. They are officially numbered by Olympiad; the Games of the XXIV Olympiad belong to 1988: Seoul.
- Championship games. Pro football numbers its championship game with Roman numerals, starting from game I in January 1967. Game XXIV was played in early 1990.
- Volumes and sequels. Book volumes, conference editions, film sequels and anniversary events often carry a Roman numeral; edition XXIV would be the 24th.
Numbers near 24 in Roman numerals
Frequently asked questions
How do you write 24 in Roman numerals?
24 is written XXIV. Break it into X (10), X (10), IV (4) and add the parts: 10 + 10 + 4 = 24.
Is XXIIII a correct way to write 24?
No. XXIIII is wrong because standard numerals never repeat a symbol four times; 4 is written IV. The standard numeral for 24 is XXIV.
What is 24 in Latin?
The Latin cardinal number 24 is “viginti quattuor.” The Romans wrote it as XXIV.
What is XXIV plus one?
XXIV + I = XXV (25). Adding one can change the whole ending of a numeral, which is why it helps to convert to digits, add, and convert back.