Why is 5.3 an irrational number?

Actually, 5.3 is not an irrational number; it is a rational number. Rational numbers can be expressed as the quotient of two integers, and 5.3 can be represented as 53/10. In contrast, Irrational Numbers cannot be expressed as a fraction of integers and have non-repeating, non-terminating decimal expansions. Examples of irrational numbers include π and √2.