All rational numbers are fractional but all fractional numbers are not rational.
For example, pi/2 is fractional but not rational.
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There is no difference. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.
Yes.
The set of rational numbers is the union of the set of fractional numbers and the set of whole numbers.
Yes.
Directly. Their difference IS the difference between them.