12 = XII in Roman numerals
The Roman numerals are XLV.
20 is Arabic Numerals XX is Roman Numerals.
XXI
DCLXVI
12 = XII in Roman numerals
The Roman numerals are XLV.
18 in roman numerals looks like XVIII
20 is Arabic Numerals XX is Roman Numerals.
300 would be represented by 'CCC' in roman numerals.
MDCCCXCV
MMDCCCLXXXVI
MCMLXXXV
MCMLXV
XXI
DCLXVI
MCMLXXXIX