What does CCLXIV mean?

CCLXIV is the Roman numeral for 264 — 100 + 100 + 50 + 10 + 4.

How do you write 264 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: C (100), then C (100), then L (50), then X (10), then IV (4). That gives CCLXIV.

264 in Roman numerals

CCLXIV

Number (1–3,999 for numerals)

Roman numeral

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

How it breaks down

CCLXIV = 100 + 100 + 50 + 10 + 4 = 264
Group	Value	Subtraction	Running total
C	100	—	100
C	100	—	200
L	50	—	250
X	10	—	260
IV	4	V − I	264

Why the smaller symbol comes first

CCLXIV uses subtractive notation in one place: IV means V minus I, or 4. 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	yes — 1×
X	10	yes — 1×
L	50	yes — 1×
C	100	yes — 2×
D	500	no
M	1,000	no

The same number, other ways

In words: Two hundred sixty-four
Roman numeral: CCLXIV
Symbol count: 6 characters
Binary: 100001000
Hexadecimal: 108

The numbers either side

Number	Roman numeral
262	CCLXII
263	CCLXIII
264	CCLXIV ←
265	CCLXV
266	CCLXVI

Common questions

What is 264 in Roman numerals?: 264 is CCLXIV.
What does CCLXIV mean?: CCLXIV is the Roman numeral for 264 — 100 + 100 + 50 + 10 + 4.
How do you write 264 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: C (100), then C (100), then L (50), then X (10), then IV (4). That gives CCLXIV.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked