Yes, because the decimal ends. 0.5 ends, compared to an irrational number such as pi, which as far as we know, goes on forever.
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Rational: yes. Natural: no.
5 = 5/1 is a rational number
Yes.
Yes, -1/2 is a rational number
One-half is rational because it can be expressed as a quotient of two integers (one divided by two).