When $0.\overline{47}$ is converted into a fraction, the result is
Aptitude
Decimal Fraction
Difficulty: Easy
Choose an option
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A$\frac{46}{90}$
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B$\frac{46}{99}$
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C$\frac{47}{90}$
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D$\frac{47}{99}$
Answer
Correct Answer: $\frac{47}{99}$
Explanation
Concept & Formula
To convert a pure recurring decimal to a fraction, write the repeated sequence as the numerator and place as many $9$s in the denominator as there are digits in the repeating sequence.
$$ 0.\overline{pq} = \frac{pq}{99} $$
Step-by-Step Solution
Given the decimal: $0.\overline{47}$
Here, the repeating sequence is $47$, which consists of exactly two digits.
Therefore, we place the number $47$ in the numerator and two $9$s in the denominator.
$$ 0.\overline{47} = \frac{47}{99} $$
Exam Strategy & Shortcut
For pure recurring decimals (where the bar starts immediately after the decimal point), simply count the digits under the bar. The number of digits equals the number of $9$s in the denominator. This can be answered visually in 2 seconds without writing anything down.
Common Pitfall
A common error is confusing pure recurring decimals with terminating decimals or mixed recurring decimals, leading students to choose a denominator of $90$ or $100$ (like option a or c). Always verify where the recurring bar begins and ends.
Final Answer
Therefore, the correct answer is $\frac{47}{99}$.