Roman-Numerals.org

Learn all about Roman Numerals!

The Additive Principle

The system for writing Roman Numerals is an additive system. This means to calculate the value of a Roman Numeral, you simply have to add up all the digits in the Roman Numeral!


Examples:

  • VIII = 5 + 1 + 1 + 1 = 8
  • XXXIII = 10 + 10 + 10 + 1 + 1 +1 = 33
  • CLXXVIII = 100 + 50 + 10 + 10 + 5 + 1 + 1 + 1 = 178
  • MMX = 1,000 + 1,000 + 10 = 2,010

There are a couple of other rules to follow:

  • Roman Numerals are always written with the largest numbers on the left, down to the smallest on the right. For example, you wouldn't write 8 above as IIIV, it's written as VIII.
  • Roman Numerals are always written with the shortest number of numerals as possible. For example, you wouldn't write 5 as IIIII, you'd always write it as V.

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