Number
324 in Roman numerals
324 is written CCCXXIV
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How CCCXXIV is built
Roman numerals are written one decimal place at a time, largest first.
- CCChundreds · 3C written 3 times: 3 × 100 = 300.
- XXtens · 2X written 2 times: 2 × 10 = 20.
- IVones · 4I before V means 5 − 1 = 4. This saves writing IIII.
300 + 20 + 4 = 324
The pair IV uses subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not CCCXXIIII (9 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CCCXXIV (7 letters) is the standard.
About the number 324
- 324 is even and can be split into prime factors: 2 × 2 × 3 × 3 × 3 × 3, or in Roman numerals II × II × III × III × III × III.
- 324 is a square number: 18 × 18 (XVIII × XVIII).
- CCCXXIV has 7 letters. 216 of the numbers up to 1,000 have longer numerals.
Counting from 321 to 330
Every number from 321 to 330 starts CCCXX (320); only the ending changes.
| Number | Roman numeral |
|---|---|
| 321 | CCCXXI |
| 322 | CCCXXII |
| 323 | CCCXXIII |
| 324 | CCCXXIV |
| 325 | CCCXXV |
| 326 | CCCXXVI |
| 327 | CCCXXVII |
| 328 | CCCXXVIII |
| 329 | CCCXXIX |
| 330 | CCCXXX |