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Reema claims that the decimal expansion of \(\frac{13}{120}\) will terminate because 120 has both 2 and 5 as factors. Which option correctly identifies the error in Reema’s statement?

Answer and explanation

Correct answer: The decimal expansion will be non-terminating recurring because the denominator, 120 in lowest terms, also has 3 as a factor.

The fraction is already in lowest terms because 13 and 120 have no common factor. A rational number has a terminating decimal only if its denominator in lowest terms has no prime factors other than 2 and 5. Since \(120=2^3\times3\times5\), the factor 3 means \(\frac{13}{120}\) has a non-terminating recurring decimal expansion.

Related tags

Real NumbersRational NumbersDecimal ExpansionNumber SystemsMathematicsClass 9 Mcq

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