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A student says that the decimal expansion of \(\frac{77}{600}\) will terminate because it is a rational number. Which is the correct analysis of the student's error?

Answer and explanation

Correct answer: The decimal expansion is non-terminating recurring because \(600=2^3\times3\times5^2\) also contains the factor 3.

In lowest form, \(p/q\) terminates only when \(q=2^m5^n\). Since \(600=2^3\times3\times5^2\) contains 3, the decimal is non-terminating recurring, not irrational. Exam tip: first check whether the fraction is in lowest form.

Related tags

Number SystemsRational NumbersDecimal ExpansionRecurring DecimalsClass 9 MathematicsDecimal RepresentationMathematicsClass 9 Mcq

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