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If ( \frac{p}{q} ) is in simplest form and (q=2^5\times5^8), what is the maximum number of decimal places in the terminating decimal?

Answer and explanation

Correct answer: (8)

The denominator \\(2^5\times5^8\\) contains only the prime factors 2 and 5, so the fraction can have a terminating decimal after simplification. To convert the denominator into a power of 10, the five factors of 2 are paired with five factors of 5. Three factors of 5 remain, and supplying three factors of 2 gives \\(2^8\times5^8=10^8\\).

Therefore the greatest possible number of decimal places is eight, which is option B. The rule is to use the larger exponent, \\(\max(5,8)=8\\), rather than adding the exponents to get 13. Cancellation involving the numerator can make the decimal shorter, but it cannot require more than eight places under the stated simplified denominator.

Related tags

Number-SystemsDecimal-RepresentationDecimal-Places

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