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In simplest form, what type of decimal expansion will ( \frac{84}{308} ) have?

Answer and explanation

Correct answer: Non-terminating recurring

Reduce the fraction before examining its decimal expansion. The numerator 84 and denominator 308 have a common factor of 28. Dividing both by 28 gives 84/308 = 3/11. The denominator in lowest form is therefore 11, not 308.

A rational number has a terminating decimal only when the denominator in simplest form contains no prime factors except 2 and 5. Since 11 is another prime factor, the decimal cannot terminate. Indeed, 3/11 = 0.2727..., so the block 27 repeats endlessly. Therefore the decimal expansion is non-terminating recurring, and option C is correct. The fraction’s original denominator does not need to be used after reduction.

Related tags

Number-SystemsDecimal-RepresentationSimplest-Form-Test

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