Roman Numerals

Abbreviation	Value
I or i	1
V or v	5
X or x	10
L or l	50
C or c	100
D or d	500
M or m	1000

I or i for one

II or ii for two

III or iii for three

IV or iv for four

V or v for five

VI or vi for six

VII or vii for seven

VIII or viii for eight

IX or ix for nine

X or x for ten

The rules for reading Roman numerals:

A letter repeated once or twice repeats its value that many times (XXX = 30, CC = 200, etc).

One or more letters that are placed after another letter of greater value increases the greater value by the amount of the smaller (VI = 6, LXX = 70, MCC = 1200).

A letter placed before another letter of greater value decreases the greater value by the amount of the smaller (IV = 4, XC = 90, CM = 900).