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A student says that a fraction with an even denominator always has a terminating decimal expansion. Which statement correctly corrects this idea?

Answer and explanation

Correct answer: The decimal expansion of \(\frac{7}{20}\) terminates because, in simplest form, \(20=2^2\times5\).

A rational number has a terminating decimal expansion only when the denominator in lowest form has prime factors \(2\) and/or \(5\) only. Since \(20=2^2\times5\), \(\frac{7}{20}\) terminates. But \(30\) also has factor \(3\). Exam tip: reduce the fraction first.

Related tags

Number SystemsDecimal RepresentationRational NumbersTerminating DecimalsPrime FactorisationMathematicsClass 9 Mcq

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