= 5
444
XL equals 40.
If that is LX then it represents 60, if it is IX it represents 9.
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 system did not have a way to represent zero.
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.
The Roman numeral system was based on the tally marking system, where each unit was represented by a vertical stroke. The letter "X" was chosen to represent ten because it resembles two crossed lines, which could be seen as a more efficient way to represent a tally of ten units. It was a practical and visually distinctive symbol to represent the number ten in the Roman numeral system.
The Roman numerals MCMXXI represent the number 1921.
MCMLX under today's rules governing the Roman numeral system they represent the year 1960
hindu-arabic numeral system
The Hindu-Arabic numeral system which replaced the Roman numeral system.