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Which fraction has a terminating decimal?

Answer and explanation

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

For \(\frac{13}{40}\), the denominator is \(40=2^3\times5\). A fraction in lowest terms has a terminating decimal only when its denominator has no prime factors other than 2 and 5. Hence, \(\frac{13}{40}=0.325\) is terminating. In contrast, \(\frac{7}{15}\) has 3 in its denominator, and \(\frac{5}{21}\) has 3 and 7, so their decimals are non-terminating recurring. Exam tip: First reduce the fraction to lowest terms, then factorise the denominator.

Related tags

Real NumbersTerminating DecimalsRational NumbersPrime FactorisationNumber SystemsDecimal RepresentationMathematicsClass 9 Mcq

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