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Ravi says that if, in simplest form, a fraction has only 2 and 5 as prime factors of its denominator, then its decimal expansion terminates. Which of the following fractions is an example supporting his statement?

Answer and explanation

Correct answer: \(\frac{21}{84}\)

\(\frac{21}{84}=\frac14\), and \(4=2^2\); hence its decimal form terminates at \(0.25\). In \(\frac{7}{30}\), the factor 3 remains, so it is non-terminating recurring. Exam tip: simplify the fraction before checking the denominator.

Related tags

Number SystemsTerminating DecimalsRational NumbersPrime FactorisationFractionsClass 9 MathematicsDecimal RepresentationMathematics

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