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Which decimal terminates?

Answer and explanation

Correct answer: \(\frac{9}{32}\)

For \(\frac{9}{32}\), the denominator is \(32=2^5\). In lowest form, a rational number has a terminating decimal only when its denominator has prime factors \(2\) and/or \(5\) only. Hence, \(\frac{9}{32}=0.28125\) terminates. The denominators of \(\frac{5}{18}\) and \(\frac{11}{27}\) contain the factor \(3\), and \(\frac{7}{21}=\frac{1}{3}\) also has a factor \(3\) in its reduced denominator, so they are non-terminating recurring decimals. Exam tip: Reduce the fraction first, then factorise its denominator.

Related tags

Terminating DecimalsRational NumbersPrime FactorisationNumber SystemsClass 9 MathematicsDecimal RepresentationMathematicsClass 9 Mcq

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