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MMI
12 = XII in Roman numerals
The Roman numerals are XLV.
XXI
DCLXVI
MCMLXXXIX
18 in roman numerals looks like XVIII
300 would be represented by 'CCC' in roman numerals.
MDCCCXCV
MMDCCCLXXXVI
MCMLXXXV
MCMLXV
XL
MCMLII
mmxiii
D1X