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A student says that if the denominator of a fraction in lowest form has a prime factor other than 2 and 5, its decimal expansion is non-terminating recurring. Which fraction is an example of this statement?

Answer and explanation

Correct answer: \(\frac{7}{12}\)

For \(\frac{7}{12}\), \(12=2^2\times3\). Since 3 occurs in the denominator, its decimal form is \(0.58\overline{3}\), which is non-terminating recurring. The other denominators contain only 2 and 5. Exam tip: first reduce the fraction to lowest terms.

Related tags

Number SystemsDecimal RepresentationTerminating DecimalsRecurring DecimalsRational NumbersPrime FactorsMathematicsClass 9 Mcq

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