24 in Roman numerals
XXIV
The number 24 is written XXIV in Roman numerals.
How XXIV breaks down
| Symbols | Value |
|---|---|
XX | 2 × 10 = 20 |
IV | 4 |
XXIV | 24 |
This numeral uses the subtractive rule: a smaller symbol placed before a larger one is subtracted from it. Only six such pairs are legal — IV (4), IX (9), XL (40), XC (90), CD (400) and CM (900).
Nearby numbers
| Number | Roman numeral |
|---|---|
| 19 | XIX |
| 20 | XX |
| 21 | XXI |
| 22 | XXII |
| 23 | XXIII |
| 24 | XXIV |
| 25 | XXV |
| 26 | XXVI |
| 27 | XXVII |
| 28 | XXVIII |
| 29 | XXIX |
The seven symbols
I | 1 | C | 100 |
V | 5 | D | 500 |
X | 10 | M | 1,000 |
L | 50 |
24 in other notations
| Roman | XXIV |
| Binary | 11000 |
| Hexadecimal | 18 |
| Octal | 30 |
| Written out | twenty-four |
Writing it by hand
Work down through the symbol values, taking as many of each as will fit before moving to the next. For 24:
2 × X = 20 remaining: 4
IV = 4 remaining: 0The result reads XXIV — 4 characters, against 2 digits in Arabic numerals.
Frequently asked questions
What is 24 in Roman numerals?
XXIV
How do you read XXIV?
Work left to right, adding each symbol — except where a smaller symbol precedes a larger one, in which case it is subtracted. XX is 20, IV is 4, giving 24 in total.
How do you write 24 in words?
twenty-four.
Why is there no zero?
Roman numerals have no symbol for zero. The concept reached Europe only with Hindu-Arabic numerals, centuries after the system was in use — which is a large part of why it was eventually replaced for arithmetic.