From the numbers in them.
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The Arabic numbers for 1859 are 1859, the Roman numerals for 1859 are MDCCCLIX.
We need arabic numbers because they are the ones we use everyday. Such as 1,2,3,4,5,6,7,8,9,10
It is the Hindu-Arabic numeral system.
Because they are common to both the Hindu and Arabic language.
There are really only three main counting systems: roman numerals, tallys, and Arabic numbers. Arabic numbers are the simplest to make large number combonations.