real and rational
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3.5 is real, rational, and natural. It's not irrational, integer, or whole.
It is real, rational but not the others.
It can be written as a fraction, so it is rational. It is not an integer, whole number or irrational.
It is Real, Rational, Integer, Whole and Counting but not Irrational
Since pi is an irrational number, then 3pi will be an irrational also.