At least the following families: all integers; all positive integers; all odd integers; and all "square integers", that is, integers that are squares of other integers.
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rational
A half belongs to the positive fractions family, which comes under fractions, which comes under the large family of rational numbers.
irrational
Rational numbers and Real numbers
It belongs to the interval (25, 27.3), or [-20.9, 10*pi], and infinitely more such intervals.It also belongs to the set of rational numbers, real numbers, complex numbers and quaternions.