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Which number has a terminating decimal expansion?

Answer and explanation

Correct answer: \(\frac{13}{40}\)

For \(\frac{13}{40}\), the denominator is \(40=2^3\times5\). A rational number in lowest terms has a terminating decimal expansion only when its denominator has no prime factors other than 2 and 5. \(\frac{7}{12}\) contains the factor 3 in its denominator, and \(\frac{11}{33}=\frac{1}{3}\), so they do not terminate. Exam tip: first reduce the fraction to lowest terms, then factorise the denominator.

Related tags

Terminating DecimalsRational NumbersPrime FactorisationNumber SystemsDecimal RepresentationMathematicsClass 9 Mcq

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