5 is rational, because it can be written with a finite number of digits (only one digit, as it turns out). The fraction one third, in comparision, written as a decimal looks like .33333333333... in an infinite expansion, which makes it irrational.
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A rational number is, by definition, the answer from dividing one integer by another.
A rational number is any number that can be written in the form a/b, where "a" and "b" are integers. Examples: 1/3, 2/3, 5/2, -2/7, and all integers, e.g. 5 (= 5/1).
Yes, -5 is a rational number
5 = 5/1 is a rational number
It is rational.