MMI
The Roman numerals are XLV.
20 in Roman numerals is XX.
Arabic ' 12 Roman ; XII Look ant any classical analogue clock, you will see the '12' written in Roman numerals 'XII'.
MCMLXXXIX
DCLXVI
The Roman numerals are XLV.
18 in roman numerals looks like XVIII
20 in Roman numerals is XX.
300 would be represented by 'CCC' in roman numerals.
MCMLXXXIX
DCLXVI
D1X
MCMLXXXV
MMDCCCLXXXVI
XLVI
XXI
MCMLII