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A student says that \(0.272727\ldots\) is an irrational number because its decimal expansion does not terminate. Which evaluation of the statement is correct?

Answer and explanation

Correct answer: The statement is incorrect because a recurring decimal can be rational.

Option B is correct. In \(0.272727\ldots\), the block 27 repeats indefinitely, so it is a recurring decimal and can be expressed as a ratio of two integers; therefore, it is rational. The student's mistake is assuming that every non-terminating decimal is irrational. Non-terminating non-recurring decimals are irrational, whereas recurring decimals are rational. Exam tip: a terminating or recurring decimal represents a rational number.

Related tags

Real NumbersRational NumbersIrrational NumbersRecurring DecimalsDecimal ExpansionError AnalysisNumber SystemsMathematics

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