because humans have 10 fingers, in olden days they used to count using their fingers
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Presumably because the digits on their hands add up to 10
It is mainly because humans have ten digits: fingers and thumbs. As a result, from prehistoric times, one of our counting bases has been ten.
There is no such example. If you cannot use an exact fraction then there will not be an exact decimal that you can use instead. And, if you are using an approximate decimal, you could use an approximate fraction instead.
terminating decimal is when the quotient has the remainder of zero.
To type a decimal point, you use the period key. .