What does CCXXIX mean?

CCXXIX is the Roman numeral for 229 — 100 + 100 + 10 + 10 + 9.

How do you write 229 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: C (100), then C (100), then X (10), then X (10), then IX (9). That gives CCXXIX.

229 in Roman numerals

CCXXIX

Number (1–3,999 for numerals)

Roman numeral

229 is written CCXXIX in Roman numerals. That is 5 symbol groups added together, reading left to right from the largest value down.

How it breaks down

CCXXIX = 100 + 100 + 10 + 10 + 9 = 229
Group	Value	Subtraction	Running total
C	100	—	100
C	100	—	200
X	10	—	210
X	10	—	220
IX	9	X − I	229

Why the smaller symbol comes first

CCXXIX uses subtractive notation in one place: IX means X minus I, or 9. A smaller symbol placed before a larger one is subtracted from it rather than added, which is why IX is nine and not eleven.

Only six such pairs are valid — IV, IX, XL, XC, CD and CM. That restriction is what makes the notation unambiguous: IIII and IC both look like they should work, but neither is standard, and only one spelling of any number is correct.

The symbols

Symbol	Value	Used here
I	1	yes — 1×
V	5	no
X	10	yes — 3×
L	50	no
C	100	yes — 2×
D	500	no
M	1,000	no

The same number, other ways

In words: Two hundred twenty-nine
Roman numeral: CCXXIX
Symbol count: 6 characters
Binary: 11100101
Hexadecimal: E5

The numbers either side

Number	Roman numeral
227	CCXXVII
228	CCXXVIII
229	CCXXIX ←
230	CCXXX
231	CCXXXI

Common questions

What is 229 in Roman numerals?: 229 is CCXXIX.
What does CCXXIX mean?: CCXXIX is the Roman numeral for 229 — 100 + 100 + 10 + 10 + 9.
How do you write 229 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: C (100), then C (100), then X (10), then X (10), then IX (9). That gives CCXXIX.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked