Reverse Roman Numerals Converter
- Roman numerals use seven basic symbols: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000).
- To convert an Arabic number, find the largest Roman symbol that fits into it, write that symbol down, subtract its value, and repeat the process with the remainder.
- When a smaller symbol is placed before a larger one, it means subtraction — this is how values like IV (4), IX (9), XL (40), XC (90), CD (400), and CM (900) are formed.
- A single symbol can be repeated up to three times in a row (for example III = 3 or XXX = 30), but never four times — that is when a subtractive pair is used instead.
- Always work from the highest value to the lowest, peeling off one symbol or subtractive pair at a time until nothing remains.
- For example, to convert 1,987 you would write: M (1000) + CM (900) + LXXX (80) + VII (7) = MCMLXXXVII.
- The standard system only covers numbers from 1 to 3,999, since there is no classical single symbol for 5,000 or above and no representation for zero.
Roman numerals in word problems:
- Roman numerals
Write numbers written in Roman numerals as a decimal. - Addition of Roman numbers
Added together and written as decimal numbers: LXXV + MCCCXV - Roman numerals 2+
Add up the number written in Roman numerals. Write the results as roman numbers. - Roman numerals 2- Subtract the number written in Roman numerals. Write the results as Roman numbers.
- Points scored
Petr scored 18 points, Jirka half, Roman scored 3 points less than Petr, and Zdenek one point less than Jirka. Find out how many points Zdenek got. - Roman numerals + Add up the number written in Roman numerals. Write the results as a decimal number.
- Classmates
Roman is ranked 12th highest and eleventh lowest pupil. How many classmates does Roman have?
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