The predominant number system used by humans (though some cultures do or did use other number systems), this is almost certainly because humans have ten fingers (digit is also the anatomical term referring to fingers and toes).
Computers use other number systems and so, sometimes, do people using computers. binary, octal and hexadecimal are common (because they are easy to implement on a computer. Humans' use of decimal gave rise to [binary coded decimal]? in the context of computers.
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