Add together the individual numerals (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5, I = 1) unless a smaller numeral precedes a larger one in which case subtract it from the larger one.
A numeral included in parentheses (or written with a bar over it) is multiplied by 1000.
→ MMMDCCCVIII = 1000 + 1000 + 1000 + 500 + 100 + 100 + 100 + 5 + 1 + 1 + 1 = 3808
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You represent a repeating number by putting a dash on top of the number. For example 56.1066666 you represent it by putting a dash on top of the 6
The letter that represent the composite number is letter C.
8.3 is not a whole number and so cannot represent any whole number.
any number at all
Whatever you choose it to represent.