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Why is the decimal expansion of \(\frac{5}{6}\) not terminating?

Answer and explanation

Correct answer: Because, in simplest form, the denominator \(6=2\times3\) contains the factor \(3\)

\(\frac{5}{6}\) is in simplest form and \(6=2\times3\). A rational number has a terminating decimal expansion only if the prime factors of its denominator, in simplest form, are only \(2\) and/or \(5\). Since \(3\) is also a factor, \(\frac{5}{6}=0.8333\ldots\) is non-terminating recurring. An even denominator is not sufficient; although \(6\) is even, it contains the factor \(3\). Exam tip: first reduce the fraction to lowest terms and then factorise its denominator.

Related tags

Number SystemsDecimal RepresentationTerminating DecimalsRecurring DecimalsRational NumbersPrime FactorisationMathematicsClass 9 Mcq

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