Roman numerals

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Roman numerals are a numeral system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers are written with combinations of letters from the Latin alphabet, each letter with a fixed integer value. Modern style uses only these seven:

I	V	X	L	C	D	M
1	5	10	50	100	500	1000

I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII

The notations IV and IX can be read as "one less than five" (4) and "one less than ten" (9), although there is a tradition favouring representation of "4" as "IIII" on Roman numeral clocks.^[1]

Other common uses include year numbers on monuments and buildings and copyright dates on the title screens of movies and television programs. MCM, signifying "a thousand, and a hundred less than another thousand", means 1900, so 1912 is written MCMXII. For the years of the current (21st) century, MM indicates 2000; this year is MMXXIV (2024).

^ Judkins, Maura (4 November 2011). "Public clocks do a number on Roman numerals". The Washington Post. Archived from the original on 15 November 2020. Retrieved 13 August 2019. Most clocks using Roman numerals traditionally use IIII instead of IV... One of the rare prominent clocks that uses the IV instead of IIII is Big Ben in London.

[1] Judkins, Maura (4 November 2011). "Public clocks do a number on Roman numerals". The Washington Post. Archived from the original on 15 November 2020. Retrieved 13 August 2019. Most clocks using Roman numerals traditionally use IIII instead of IV... One of the rare prominent clocks that uses the IV instead of IIII is Big Ben in London.

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