ROMAN NUMERALS

Basic Principles

When a small number comes before a larger number, the smaller number is
subtracted.  .

e.g. 4 = IV  (i.e. 5 – 1) 

When a smaller number follows a larger one, the two are added together.

e.g. 6 = VI (i.e. 5 + 1)]

When a letter is repeated is repeats its value –

e.g.      
XX = 10 + 10
           XXX = 10 + 10 + 10

The letters V,
L and D are never repeated as
X, C and
M serve that
purpose.

e.g. 10 = X not
VV     100 = C not
LL
     1000 = M not DD

A dash line over a numeral multiplies its value by 1000 –

        __
e.g.   X  = 10,000  

A bar across the top of the letter
increases the number 1,000 times.