CD = 400 D means 500, by putting the C in front it means we're subtracting it. DC = 600
I=1 V=5 X=10 L=50 C=100 D=500 and M=1000
M/CM/XXC/I = 1981
OR - as per BBC usage, MCMLXXXI = M/CM/L/XXX/I = 1981
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400 in roman numerals is CD C=100 and because it come before D (D=500) you would subtract the 100 from the 500 and make 400 which is in roman numerals is CD
Roman numerals for 201 = CCI
MCCXXVIII
DCC
II