What does MCCXC mean?

MCCXC is the Roman numeral for 1,290 — 1000 + 100 + 100 + 90.

How do you write 1290 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then C (100), then XC (90). That gives MCCXC.

1,290 in Roman numerals

MCCXC

Number (1–3,999 for numerals)

Roman numeral

1,290 is written MCCXC in Roman numerals. That is 4 symbol groups added together, reading left to right from the largest value down.

How it breaks down

MCCXC = 1000 + 100 + 100 + 90 = 1,290
Group	Value	Subtraction	Running total
M	1,000	—	1,000
C	100	—	1,100
C	100	—	1,200
XC	90	C − X	1,290

Why the smaller symbol comes first

MCCXC 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	no
M	1,000	yes — 1×

The same number, other ways

In words: One thousand two hundred ninety
Roman numeral: MCCXC
Symbol count: 5 characters
Binary: 10100001010
Hexadecimal: 50A

The numbers either side

Number	Roman numeral
1,288	MCCLXXXVIII
1,289	MCCLXXXIX
1,290	MCCXC ←
1,291	MCCXCI
1,292	MCCXCII

Common questions

What is 1290 in Roman numerals?: 1,290 is MCCXC.
What does MCCXC mean?: MCCXC is the Roman numeral for 1,290 — 1000 + 100 + 100 + 90.
How do you write 1290 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: M (1000), then C (100), then C (100), then XC (90). That gives MCCXC.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked