Roman MMCX in Arabic - Roman to Arabic Numerals Converter

• If a numeral is followed by another numeral of lower denomination, the two are added together;
• if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.

Thus XI = 11 (X + I), but IX = 9 (X – I).

Other examples are XXC = 80, CXL = 140, XV = 15, XLVIII = 48.

Thousands from 1000 to 9000 are represented as: M, MM, MMM,MMMM, MMMMM, MMMMMM, MMMMMMM, MMMMMMMM, MMMMMMMMM.

Multiples of a thousand are also/alternatively indicated by a superior bar: thus, V̅ = 5 000, V̅I̅ = 6 000, V̅I̅I̅ = 7000, ... , X̅ = 10000, X̅X̅D̅ = 480 000, etc.

How to read a Roman Numeral

Break the number into Thousands, Hundreds, Tens and Units and write down each in turn.

Example: Convert 1989 to Roman Numerals.

Break 1989 into 1000, 900, 80 and 9, then do each conversion

• 1000 = M
• 900 = CM
• 80 = LXXX
• 9 = IX
• So, 1989 = MCMLXXXIX

Sample Roman Numerals Conversions