M=1000
CM=900
LXXX=80
I=1
Therefore
MCMLXXXI=1981
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MCMLXXXI is already a Roman numeral. In Hindu-Arabic numerals it equates to 1981.
M=1000 CM=900 LXXX=80 I=1 Therefore MCMLXXXI=1981
It is the Hindu-Arabic numeral system.
X=10 in Hindu-Arabic.
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