Rational numbers are ratios of two integers (the second of which is not zero). They are important if any number needs to be divided into equal parts.
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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.
All rational numbers are real numbers.
They are only an infinitesimally tiny part of the set of real numbers.
yes * * * * * No. Rational and irrational numbers are two DISJOINT subsets of the real numbers. That is, no rational number is irrational and no irrational is rational.
All prime numbers are rational.