CCCXXIX in numbers
CCCXXIX = 329.
Three hundred twenty-nine written as a Roman numeral.
329 in words: Three hundred twenty-nine
CCCXXIX is 329, "three hundred twenty-nine". It is built from CCC (300), XX (20) and IX (9), read from the largest value down and added together. It uses the subtractive form IX, where a smaller symbol placed before a larger one means one less.
Put plainly, the numeral CCCXXIX in numbers is 329 ("Three hundred twenty-nine"). Type it into the converter above and it reads straight back, which is the fastest way to check a numeral you have found on a clock face, a cornerstone, a film credit or a tattoo before you trust it.
How CCCXXIX is built
| Group | Value |
|---|---|
| CCC | 300 |
| XX | 20 |
| IX | 9 |
| CCCXXIX | 329 |
How to read CCCXXIX
Roman numerals are read left to right, largest value first, adding as you go. Scanning CCCXXIX one group at a time gives a running total that lands on 329:
| Read | Worth | Running total |
|---|---|---|
| CCC | 300 | 300 |
| XX | 20 | 320 |
| IX | 9 | 329 |
The one place that scan can trip you up is the pair IX. A smaller letter sitting in front of a larger one is subtracted, not added, so you have to read those two letters as a single unit rather than one at a time. Treat IX as one group and the rest of CCCXXIX falls into place.
Where you will see CCCXXIX
Counted in order, CCCXXIX is the three hundred twenty-ninth number. Read as a year, 329 falls in the 4th century AD. It sits between the round anchors CCC (300) and CD (400), which is the quickest way to place a numeral of this size at a glance.
Past a hundred, a numeral like CCCXXIX shows up mainly in dates, formal enumeration and anywhere a large figure is written out in full. You read it exactly as you read the small ones, by taking each group from the largest value down, "three hundred twenty-nine".
- Chapters and sections: Long documents number their parts in Roman numerals: legal codes, multi-volume sets and numbered sections all reach values like CCCXXIX, part 329.
- Dates and credits: Whenever a year or a copyright line is set in Roman numerals, values like CCCXXIX appear in full, which is where longer numerals are most commonly seen.
Frequently asked questions
What does CCCXXIX mean in Roman numerals?
CCCXXIX means 329 in Roman numerals, which is "three hundred twenty-nine" in words.
What is CCCXXIX in numbers?
CCCXXIX in numbers is 329. Read the letters from the largest value down and add each group together.
Is CCCXXIX a valid Roman numeral?
Yes. CCCXXIX follows the standard rules and is the correct way to write 329.
Where is CCCXXIX used?
Long documents number their parts in Roman numerals: legal codes, multi-volume sets and numbered sections all reach values like CCCXXIX, part 329. Whenever a year or a copyright line is set in Roman numerals, values like CCCXXIX appear in full, which is where longer numerals are most commonly seen.
What century does the year 329 fall in?
The year 329, written CCCXXIX, falls in the 4th century AD.
Nearby numerals
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.