Which number is represented by the Roman numeral D?

Roman numerals are a system of numerical notations used by the Romans. They are an additive (and subtractive) system in which letters are used to denote certain "base" numbers, and arbitrary numbers are then denoted using combinations of symbols. Unfortunately, little is known about the origin of the Roman numeral system.

The following list gives the Latin letters used in Roman numerals and the corresponding numerical values they represent.

I = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000

For example, the number 1732 would be denoted MDCCXXXII in Roman numerals. The practice of placing smaller digits before large ones to indicate subtraction was hardly ever used by Romans and came into popularity in Europe after the invention of the printing press.

Today, Roman numerals are encountered in the release year for movies and occasionally on the faces of watches and clocks. London's famous clock tower is a primary example.