= 5
444
XL equals 40.
If that is LX then it represents 60, if it is IX it represents 9.
The Roman Numeral system did not have a way to represent zero.
The Roman numerals was the numerical system used in Ancient Rome and used a combination of letters, for example the Roman numeral VII would represent the numbers 5 and 1 and 1, adding the total of the numerals VII would represent the number seven.
The Roman numeral 'L' stands for 50 and the Roman numeral 'I' stands for 1. Put them together as LI and you get 51. LII would be 52, etc.
They didn't because it was the Etruscans that did and presumably it meant a double V (5) which is X (10). The Roman numeral system originated from the Etruscan numeral system and the Etruscans once ruled the Romans.
Under the rules now governing the Roman numeral system MCMXXI is equivalent to 1921
MCMLX under today's rules governing the Roman numeral system they represent the year 1960
Numeral
The Hindu-Arabic numeral system which replaced the Roman numeral system.