How to Read Roman Numbers and Convert from Arabic to Roman?

The Roman numerals are represented by the following letters:
  • I = 1
  • V = 5
  • X = 10
  • L = 50
  • C = 100
  • D = 500
  • M = 1000
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 2241 to Roman Numerals.

Break 2241 into 2000, 200, 40 and 1, then do each conversion

2000 = MM
200 = CC
40 = XL
1 = I

So, 2241 = MMCCXLI

Roman to Arabic Numerals Chart Hundreds

C 100 One hundred
CC 200 Two hundred
CCC 300 Three hundred
CD 400 Four hundred
D 500 Five hundred
DC 600 Six hundred
DCC 700 Seven hundred
DCCC 800 Eight hundred
CM 900 Nine hundred

Roman to Arabic Numerals Chart - Thousands

M 1000 One thousand
MM 2000 Two thousand
MMM 3000 Three thousand
MMMMM 4000 Four thousand
MMMMM 5000 Five thousand
MMMMMM etc.

Roman to Arabic numerals from 1 to 100 by - Tens

X 10
XX 20
XXX 30
XL 40
L 50
LX 60
LXX 70
LXXX 80
XC 90
C 100

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