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Which of the following numbers has a decimal expansion that is neither terminating nor recurring?

Answer and explanation

Correct answer: \(\sqrt{2}\)

\(\sqrt{2}\) is an irrational number, so its decimal expansion is non-terminating and non-recurring. In contrast, \(0.125\) is terminating, \(0.\overline{27}\) is recurring, and \(\sqrt{81}=9\) is rational. Exam tip: the decimal expansion of every rational number is either terminating or recurring, whereas an irrational number has a non-terminating, non-recurring decimal expansion.

Related tags

Real NumbersRational NumbersIrrational NumbersDecimal ExpansionNumber SystemsMathematicsClass 9 Mcq

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