How do you write 21 in Roman numerals?
Answer
XXI
21 = 20 (XX) + 1 (I)
Number21
Roman numeralXXI
Breakdown20 (XX) + 1 (I)
Letters3
To write 21 in Roman numerals, split it into thousands, hundreds, tens and units and write each part: 20 (XX) + 1 (I). Put together, that gives XXI.
Roman numerals use seven letters: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1000. A smaller letter in front of a larger one is subtracted (IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900); otherwise the values are added.
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Frequently asked questions
What is 21 in Roman numerals?
21 is written as XXI.
How is XXI built?
XXI = 20 (XX) + 1 (I).
What is the largest Roman numeral?
With standard letters the largest number is 3999, written MMMCMXCIX.