A rational number can be written as a fraction. It can be written either as a proper fraction (13) where the denominator is larger than the numerator; or as an improper fraction (125).
(Higher Students: recurring decimals can be written as a fraction, and are therefore rational)
An irrational number cannot be written as a fraction. Examples of irrational numbers include π and √2.
Is (π ÷ 4) a rational number?
Answer: No, because π is not a rational number.
Is -√0.25 a rational number?
-√0.25
=-(0.5)
=-12
Because it can be written as a fraction, it is a rational number.
Answer: Yes, because it can be written as -12