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How to Read Roman Numerals – The Subtractive Principle

The ‘Subtractive Principle’ in Roman Numerals

roman numerals subtractive principle

Roman Numerals Subtractive Principle

The technical term ‘subtractive principle’ simply means when smaller numerals are on the left of larger ones you subtract them to get the total.

e.g. XL = 50 – 10 = 40

Personally I like the way it is shown on the graphic but you’ll have to work out which way works for you.

 

 

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