Roman Numerals 1 to 200
2026-02-28 23:19 Diff
https://brightchamps.com/en-us/math/numbers/roman-numerals-1-to-200

Roman Numerals follow rules to make sure the number is written correctly. Here are some main rules given below:

  • Rule 1: Addition Method
     
  • Rule 2: Repetition Method
     
  • Rule 3: Subtraction Method
     
  • Rule 4: Limitation Rule

Rule 1: Addition Method In Roman Numerals, if the smaller numeral comes after the large numeral, then we need to add their values.

Example: If the given number is CXX. We can see that the number C refers to 100, and the other numerals refer to 20. So in this, the smaller numeral is after the large numeral, so we need to add the 100 and 20 to get the value 120.

Rule 2: Repetition Method The Roman Numeral can be repeated up to three times to increase its value. The numbers cannot be repeated after three times. Only symbols like I, X, C, and M can be repeated, and V, L, and D cannot be repeated.

Example: XXX = 10 + 10 + 10 = 30 repeating the numeral X for the fourth time is not allowed.

Rule 3: Subtraction Method If the smaller numeral comes before the large numeral, then we need to subtract the smaller numeral from the larger numeral to get the number. There are three rules in subtraction, they are: I can be subtracted from V and X. X can be subtracted from L and C. C can be subtracted from D and M.

Example: In the number XL. Here, L is the biggest numeral, and X is the smallest numeral. As we see that the smaller numeral is before the larger numeral, we need to subtract to get the number. L (50) - X (10) = XL (40).

Rule 4: Limitation Rule Roman Numerals consist of several limitations, they are: A numeral cannot be repeated more than three times. For example, III (3) cannot be repeated more than 3 times; instead, we use IV for writing 4.

Subtraction cannot be done with non-pair numbers. For example, XI here X (10) - I(1) gives IX is applicable, but IC, C (100) - I(1) is not applicable. Only one subtraction can be allowed in one numeral.

For example, XL (40), L (50) - X (10) is applicable to get 40, but XXL is not applicable to get the number 30.