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Yes. any fraction or decimal is a rational number, not an integer.
Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction. You must make sure it can be written as a fraction.
They make a rational number.
Rational and irrational numbers.
Yes. Together, they make up the entire set of real numbers. That is to say, any real number is either rational or irrational.