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V is 5, X is 10 and D is 500. You would never see them in this order because all symbols must be written in descending order of value. DXV would therefore mean 515 (that is, 500 + 10 + 5).

There are 13 symbols in all:

I = 1

IV = 4

V = 5

IX = 9

X = 10

XL = 40

L = 50

XC = 90

C = 100

CD = 400

D = 500

CM = 900

M = 1000

No symbol may repeat more than 3 times in succession, thus it is possible to create values from 1 to 3999 using these symbols alone. To convert a Roman numeral to its Hindu-Arabic equivalent, convert each symbol to the values shown above, then add them together. To convert a Hindu-Arabic numeral to its Roman equivalent, repeatedly subtract the largest value that is less than or equal to the value, until the value is zero, and writing down the symbol after each subtraction.

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