You also cannot subtract a number from one that is more than 10 times greater. But following the rule, it instead is XIII, or 10 plus 3. It's easy to see how the reasoning would be: 15 minus 1 minus 1. XC equals 100 minus 10, or 90, so XC plus V, or 90 plus 5, equals 95.Īlso, only one number can be subtracted from another. When it comes to subtracting amounts, only powers of 10 are subtracted, like I, X, or C, but not V or L. For example, do not use the same symbol more than three times in a row. There are a number of other rules related to Roman numerals. (Image credit: Michaela Stejskalova (opens in new tab) Shutterstock (opens in new tab))
A medieval clock in Prague, Czech Republic, has Roman numerals on its face.
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