Because they come from the Hindu-Arabic numeral system developed by Indian mathematicians.
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Because they originated from the Arabic countries and they replaced Roman numerals during the Middle Ages.
Because that's where they originated from.
I don't think it matters, but since the word "algebra" is of Arabic origin, let's go with Arabic numerals for the sake of consistency.
Arabic numbers (or numerals) are the numbers we use all the time; so 0, 1, 2, 3..... and so forth, up to .... 98, 99, 100.
On Converting between Arabic and Roman Numbers ,we get :1 8970 in roman numerals is : MMMMMMMMCMLXX