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If \(p/q\) is a rational number, where \(p\) and \(q\) are coprime integers and \(q>0\), which statement about its decimal expansion is correct?

Answer and explanation

Correct answer: The decimal expansion terminates if and only if \(q=2^m5^n\), where \(m,n\) are non-negative integers.

When \(p/q\) is in lowest terms, its decimal expansion terminates exactly when the denominator \(q\) has only 2 and 5 as prime factors, that is, \(q=2^m5^n\). If the denominator has any other prime factor, the decimal expansion is non-terminating recurring, but the number is still rational. Hence options C and D are incorrect. Exam tip: Always reduce a fraction to lowest terms before checking its decimal expansion.

Related tags

Real NumbersRational NumbersDecimal ExpansionTerminating DecimalsNumber SystemsGrade 9 MathematicsMathematicsClass 9 Mcq

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