5 = 5/1 is a rational number
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The number 5 is indeed a rational number. A rational number is one that is able to be written down as a simplified fraction. The number 5 would be written as 5/1.
Yes, -5 is a rational number
A rational number is, by definition, the answer from dividing one integer by another.
It is rational.
Yes. A rational number is one that you can write as a fraction a/b, with integers a and b (b not equal to zero). For a whole number, set b = 1. For example, 5 = 5/1, so it is a rational number.