There is no difference. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
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The set of rational numbers is the union of the set of fractional numbers and the set of whole numbers.
All rational numbers are fractional but all fractional numbers are not rational. For example, pi/2 is fractional but not rational.
-0.45 is a rational number as a rational number is a number which can be written in fractional form or p\q form.So -0.45 can be written as -45\100.Hence,-0.45 is a rational number
It is a rational number, with a terminating decimal representation. It is not a whole number but comprises a fractional part.
The answer is not a rational number and therefore cannot be written out in full in decimal (or fractional) notation. It is approx 5.196152.