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In simplest form, what type of decimal expansion will ( \frac{72}{198} ) have?

Answer and explanation

Correct answer: Non-terminating recurring

First reduce the fraction before deciding its decimal type. The numerator and denominator of 72/198 have a common factor of 18, so 72/198 = 4/11. A fraction in lowest form has a terminating decimal only when its denominator has no prime factors other than 2 and 5. If another prime factor remains, the decimal continues and repeats.

The denominator 11 is a prime factor different from 2 and 5. In fact, 4/11 = 0.3636..., so the digits 36 repeat without ending. It is therefore a non-terminating recurring decimal. Hence option C is correct. The unreduced form should not be used alone, because common factors can remove some denominator factors during simplification.

Related tags

Number-SystemsDecimal-RepresentationSimplest-Form-Test

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