Because the system was developed by the Hindu-Arabians.
There are 9000 4-digit numbers in hindu-arabic numeration system
hindu-arabic is basically your normal number system - 123456789 etc
There is a difference in the numeration system of Hindu Arabic compared to other societies numeration system. The Hindu Arabic system uses symbols to represent the numbers that are lower than ten, while other societies use numbers instead of symbols.
i have now ideaImproved Answer:-It contains a zero figure thus facilitating the ease and speed of calculating numbers.
Try to multiply cxxix by dccclxvii! (That's 129 x 867)
It is the Hindu-Arabic numeral system.
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