For the same reasons other civilisations use them. To calculate.
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The Chinese number systems derived from the number systems that were in use in the Shang Dynasty.
Their are two types of number systems. 1. Non positional number systems 2. Positional number systems.
well.... if you had more then one number system and we dont use them, then the one we use is better because we use it, other wise we would use a different system. hope this helped :)
why are the number of plant systems smaller than animal systems.
The ancient Greeks had their own system of numeracy but would have known about the Roman system of numeracy