What does DCCXC mean?

DCCXC is the Roman numeral for 790 — 500 + 100 + 100 + 90.

How do you write 790 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: D (500), then C (100), then C (100), then XC (90). That gives DCCXC.

790 in Roman numerals

DCCXC

Number (1–3,999 for numerals)

Roman numeral

790 is written DCCXC in Roman numerals. That is 4 symbol groups added together, reading left to right from the largest value down.

How it breaks down

DCCXC = 500 + 100 + 100 + 90 = 790
Group	Value	Subtraction	Running total
D	500	—	500
C	100	—	600
C	100	—	700
XC	90	C − X	790

Why the smaller symbol comes first

DCCXC uses subtractive notation in one place: XC means C minus X, or 90. 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	no
V	5	no
X	10	yes — 1×
L	50	no
C	100	yes — 3×
D	500	yes — 1×
M	1,000	no

The same number, other ways

In words: Seven hundred ninety
Roman numeral: DCCXC
Symbol count: 5 characters
Binary: 1100010110
Hexadecimal: 316

The numbers either side

Number	Roman numeral
788	DCCLXXXVIII
789	DCCLXXXIX
790	DCCXC ←
791	DCCXCI
792	DCCXCII

Common questions

What is 790 in Roman numerals?: 790 is DCCXC.
What does DCCXC mean?: DCCXC is the Roman numeral for 790 — 500 + 100 + 100 + 90.
How do you write 790 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: D (500), then C (100), then C (100), then XC (90). That gives DCCXC.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked