Because understanding rational and whole numbers and in particular prime numbers it is useful when finding the lowest common multiple or the highest common factor of numbers.
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Whole numbers ARE rational.
Whole numbers are always rational
Whole numbers are the same as integers. Whole numbers are a proper subset of rational numbers.
Rational numbers. Whole numbers are numbers such as 1, 10, 25, etc.
-3 is a real, rational, whole integer. But then, -- All integers are real rational whole numbers. -- All whole numbers are real rational integers. -- All rational numbers are real. -- All counting numbers are real, rational, whole integers.