The answer is rational when you divide one whole number by another one.
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Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Z=Integers; Rational numbers={a/b| a,b∈Z, b ≠ 0}.
A rational expression is an expression that contains a radical, i.e., a root.
A rational number can be expressed as a simple fraction, an irrational number cannot. More formally: A rational number is any real number that can be expressed as a ratio of two integers (positive or negative whole numbers). (The denominator in the ratio cannot be zero.) An irrational number cannot be expressed in that way. The terms "rational" and "irrational" refer to the idea of "ratio".
Rational?