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Which option is correct about the decimal expansion of \(\frac{13}{2^2\times5\times7}\)?

Answer and explanation

Correct answer: Non-terminating recurring decimal expansion

\(\frac{13}{2^2\times5\times7}=\frac{13}{140}\) is in lowest terms because 13 and 140 have no common factor. The denominator \(140=2^2\times5\times7\) also contains the prime factor 7. A rational number has a terminating decimal expansion only if, in lowest terms, its denominator has no prime factors other than 2 and/or 5. Therefore, this decimal expansion is non-terminating recurring. A non-terminating non-recurring decimal represents an irrational number. Exam tip: reduce the fraction first, then inspect the prime factors of its denominator.

Related tags

Number SystemsDecimal ExpansionRational NumbersRecurring DecimalsTerminating DecimalsPrime FactorisationDecimal RepresentationMathematics

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