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Arabic numbers need less digits to represent large numbers (in general). When doing arithmetic operations on the numbers, Arabic is easier because of the place values can line up.
5391 is VCCCXCI. Note that the bolded V above is usually drawn with a line above it denoting 5,000 rather than 5 Thank you!!!
you put all the numbers on a horizontal line and then put Xs above the numbers depending on how many of the numbers there are.
It is used to indicate the end of a block of numbers or can be used to indicate that the number below the line is the sum of the numbers above it.
It is superior from other systems because it has separate symbols for all numbers to 10 unlike Mayan or roman numerals who for 6 have to use 2 symbols (a line under a dot for Mayan and a V then an I for roman)