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XXI is the Roman numeral representation of 21. Here, X represents 10 and I represents 1. Thus, XXI = 10 + 10 + 1 = 21. Therefore, XXI represents the value 21 in Roman numerals. The above value is derived by combining the values of specific Roman numeral symbols used in the system. In Roman numerals, the symbol ' XXI ' is used to represent 21. Mentioned below are the seven symbols used in the ancient numeric system: I - 1 V - 5 X - 10 L - 50 C - 100 D - 500 M - 1000 According to the symbols ... Watch xxi xxi xxi - All In One on Dailymotion The numbers that we normally use (1, 2, 3 etc) are called "Arabic numerals". But we sometimes use another system for writing numbers - " Roman numerals ". The Romans used letters of the alphabet to represent numbers, and you will occasionally see this system used for page numbers, clock faces, dates of movies etc. Image: On the clockface you see Roman numerals for the hours and Arabic numerals for the minutes. The letters used in Roman numerals are: I = 1 V = 5 X = 10 L = 50 C = 100 D = 500 ... Learn how to write the number 21 in Roman numerals. XXI is 21 in Roman notation - history, curiosities and applications.
