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MatematikaRia.com

# Roman Numerals

Read about Roman Numerals or go straight to the Roman Numeral Conversion Tool

## The Roman Symbols

The Romans used a special method of showing numbers, based on the following symbols:

 1 5 10 50 100 500 1000 I V X L C D M

Numbers greater than 1,000 are formed by placing a dash over the symbol, meaning "times 1,000", but these are not commonly used:

 5,000 10,000 50,000 100,000 500,000 1,000,000 V X L C D M

## Basic Combinations

 1 2 3 4 5 6 7 8 9 I II III IV V VI VII VIII IX 10 20 30 40 50 60 70 80 90 X XX XXX XL L LX LXX LXXX XC 100 200 300 400 500 600 700 800 900 C CC CCC CD D DC DCC DCCC CM

## Forming Numbers - The Rules

When a symbol appears after a larger symbol it is added

• Example: VI = V + I = 5 + 1 = 6

When a symbol appears before a larger symbol it is subtracted

• Example: IX = X - I = 10 - 1 = 9

Don't use the same symbol more than three times in a row.

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

Example: Convert 1984 to Roman Numerals:

• 1000 = M, 900 = CM, 80=LXXX, 4=IV, so 1984 = MCMLXXXIV

## Conversion Tool

You can convert to/from Roman Numerals here: