They started in the Indian sub-continent thousands of years ago when the concept of zero was first realised.
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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.
From the numbers in them.
Because they are common to both the Hindu and Arabic language.