Simple answer? Because you have ten fingers, it was the easiest to count & the ancients ran with it. There have been other base number systems, for example Sumerians & Babylonians had base 60 (that's why there are 60 minutes, 60 seconds etc).
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The base of the Chinese number system is ten.
base 5
No, it's false. "Base two" is another name for the "binary" number system ... the system running inside any kind of digital hardware, including computers. The corresponding name for the decimal number system is "base ten". The 'base' tells you how many digits the system uses to write numbers. "Base ten" uses ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 . "Base two" makes all of its numbers with only two digits.
In Math, a base is the number of numbers used to describe the mathematical system. For example, a base 2 system is called binary and uses 0 and 1; a base 10 system is a decimal system, and uses the current standard of ten numbers ranged from 0 to 10.