Around 750 A.D. this system of decimal arithmetic was brought to Persia when several important Hindu works were translated into Arabic. The noted Arab mathematician al-Khwârizmî (Muhammad b. Musa al-Khwârizmî ca. 875) wrote a textbook on the subject which now exists only in a number of Latin versions. In these a point is used for zero.
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It is the Hindu-Arabic numeral system.
Because they are common to both the Hindu and Arabic language.
There are 9000 4-digit numbers in hindu-arabic numeration system
80
3045