CD=400
V=5
therefore CDV=405
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405 = CDV (CD=500, V=5)
CDV = 405
CDV (C=100 subtracted from D=500, plus V=5) = 405 General Values in Roman Numerals: 1 = I 5 = V 10 = X 50 = L 100 = C 500 = D 1000 = M Counting goes like 1=I, 2=II, 3=III, 4=IV, 5=V, 6=VI, 7=VII, 8=VII, 9=IX, 10=X, etc.
Roman numerals were inspired by Etruscan numerals of which Roman numerals originated from.
It depends on what kind of numerals you are talking about: In Arabic numerals, it is 1000. In Roman numerals, it is M.