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Which of the following numbers has a non-terminating recurring decimal expansion?

Answer and explanation

Correct answer: \(\frac{11}{18}\)

For \(\frac{11}{18}\), the prime factorisation of the denominator is \(18=2\times 3^2\). In lowest form, the denominator contains the prime factor 3 in addition to 2 and 5, so its decimal expansion is non-terminating recurring. In contrast, the denominators of \(\frac{7}{40}\), \(\frac{13}{125}\), and \(\frac{9}{64}\) contain only 2 and/or 5, so they have terminating decimal expansions. Exam tip: In lowest form, a rational number has a non-terminating recurring decimal when its denominator has a prime factor other than 2 or 5.

Related tags

Real NumbersRational NumbersDecimal ExpansionRecurring DecimalsNumber SystemsMathematicsClass 9 Mcq

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