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What is the decimal expansion of the simplified fraction \(\frac{35}{154}\)?

Answer and explanation

Correct answer: Non-terminating repeating decimal

The governing rule is that a rational number in lowest terms has a terminating decimal only when its denominator has no prime factors other than 2 and 5. First reduce the fraction: \(35/154=5/22\), because both numerator and denominator are divisible by 7. The denominator 22 factors as \(2\times11\), and the factor 11 remains. Therefore its decimal expansion does not terminate; because the number is rational, its decimal digits repeat periodically. In fact, \(5/22=0.2272727\ldots\). Hence option B is correct. It is not irrational, not terminating, and certainly not an integer.

Related tags

Decimal RepresentationRational NumbersRecurring DecimalsNumber SystemsMathematicsClass 9 Mcq

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