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.

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