Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction. Not all real numbers are rational.
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Yes it is, but not every real number is a rational number
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The set of real numbers is divided into rational and irrational numbers. The two subsets are disjoint and exhaustive. That is to say, there is no real number which is both rational and irrational. Also, any real number must be rational or irrational.
Rational numbers are numbers that can be written as a fraction. Real numbers are any number, including irrationals.