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A student says that if the decimal expansion of a number is non-terminating and non-repeating, then the number is irrational. What is the correct analysis of this statement?

Answer and explanation

Correct answer: The statement is true; every irrational number has a non-terminating, non-repeating decimal expansion.

The statement is true. A rational number has either a terminating decimal expansion or a non-terminating recurring decimal expansion. Therefore, a decimal that is non-terminating and non-repeating represents an irrational number, for example \(\sqrt{2}=1.414213\ldots\). Option D is wrong because \(1/3=0.333\ldots\) is non-terminating but rational, since it repeats. Exam tip: For decimal-expansion questions, always check whether the digits repeat.

Related tags

Real NumbersIrrational NumbersDecimal ExpansionRational NumbersNumber SystemsMathematicsClass 9 Mcq

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