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XXV roman numerals can be written as number 25 by combining the transformed form of roman numerals, i.e XXV can be solved as X + X + V which is equal to 10 + 10 + 5 =25. In this article, we will discuss how to write xxv roman numerals to numbers. XXV is equal to 25, and XXVIII is equal to 28. The seven basic Roman numerals are I (1), V (5), X (10), L (50), C (100), D (500), and M (1000). Roman numerals are formed by combining these basic numerals in specific ways. For example, XXV is formed by combining the numerals X (10) and V (5). Seems like 490 should be XD, but the correct conversion here is CDXC. Hmm. And 990 should similarly be XM, but the correct answer here is CMXC. This must violate rules of conservation, no? Why would one use four numerals when one could use two? Please clarify. Thanks. Both asked for a reply so here it is. So IC 100-1=99. Need to decode a Roman numeral? This calculator will take a Roman numeral and turn it into an ordinary number. Write any Roman Numeral into the box and hit the button to convert.