In conversion of Roman numerals to numbers we know about the symbols of digits in different scripts. The Romans used certain special symbols to indicate numbers. These are called Roman digits. The Roman digits are used to express the numbers in Roman numerals.
There are seven Romandigits. They are I, V, X, L, C, D and M.
The values of the Roman digits in international numeration are as follow:
I = One (1) X = Ten (10) C = Hundred (100) 
V = Five (5) L = Fifty (50) D = Five hundred (500) 
Examples on conversion of Roman numerals to numbers:
Express the given Roman numerals in English numerals:
(i) VI = 5 + 1 = 6 So, VI = 6 (iii) XXIX = 10 + 10 + (10  1) = 29 So, XXIX = 29
So, XXXIX = 39
So, XVI = 16

(ii) XVII = 10 + 5 + 2 = 17 So, XVII = 17 (iv) XXVIII = 10 + 10 + 5 + 3 = 28 So, XXVIII = 28 (vi) XXIV = 10 + 10 + (5  1) = 24 So, XXIV = 24
(viii) XXV = 10 + 10 + 5 = 25 So, XXV = 25

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