It represents the number of tenths in the fractional part of the number.
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A decimal point indicates the point where a whole number ends and the fractional number begins.
If you mean the numbers to the right of the decimal point, they comprise the fractional part of the number.
It means round the number so that fewer digits after the decimal point are shown.
It is a terminating decimal.
There can be no number that has more than one decimal point.