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Reema says that if the denominator of a fraction has a prime factor other than 2 and 5, then its decimal expansion is terminating. Which example shows Reema’s error?

Answer and explanation

Correct answer: \(\frac{1}{6}\)

In \(\frac{1}{6}\), the denominator is \(6=2\times3\). Because it contains 3, its decimal is \(0.1\overline{6}\), which is non-terminating recurring. In contrast, \(\frac{3}{8}\) has only powers of 2 in its denominator. Exam tip: simplify the fraction first.

Related tags

Number SystemsDecimal RepresentationTerminating DecimalsRecurring DecimalsRational NumbersPrime FactorsMathematicsClass 9 Mcq

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