Letters represent the numbers in the Roman number system: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1,000. In this system a letter placed after another of greater value adds (thus XVI or xvi is 16), whereas a letter placed before another of greater value subtracts (thus XC is 90). Learn Roman numeral list, roman numerals 1 to 100 using the resources on this page.
