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Convert the following repeating decimal to a fraction in simplest form.

.9 bar(6)
Answer:

Convert the following repeating decimal to a fraction in simplest form.\newline.96 .9 \overline{6} \newlineAnswer:

Full solution

Q. Convert the following repeating decimal to a fraction in simplest form.\newline.96 .9 \overline{6} \newlineAnswer:
  1. Denote Repeating Decimal: Let's denote the repeating decimal 0.90.9 with a repeating 66 as xx. \newlinex=0.966666...x = 0.966666...\newlineTo convert this repeating decimal to a fraction, we can use an algebraic method where we multiply xx by a power of 1010 to move the decimal point to the right of the repeating digits.
  2. Multiply by 1010: We multiply xx by 1010 to shift the decimal point one place to the right:\newline10x=9.666666...10x = 9.666666...\newlineNotice that the digits after the decimal point are the same as in xx, which is crucial for the next step.
  3. Subtract to Eliminate Decimals: Now we set up an equation to subtract xx from 10x10x, which will eliminate the repeating decimals:\newline10xx=9.666666...0.966666...10x - x = 9.666666... - 0.966666...\newlineThis subtraction will give us a whole number on the right side of the equation.
  4. Solve for x: Performing the subtraction, we get:\newline9x=8.79x = 8.7\newlineNow we have an equation without repeating decimals that we can solve for xx.
  5. Divide by 99: To find xx, we divide both sides of the equation by 99:\newlinex=8.79x = \frac{8.7}{9}
  6. Convert to Fraction: Now we convert the decimal 8.78.7 to a fraction. The decimal 8.78.7 is the same as 8710\frac{87}{10}, so we substitute that into our equation:\newlinex=87109x = \frac{\frac{87}{10}}{9}
  7. Simplify Fraction: To simplify the fraction, we multiply the denominator 1010 by 99:x=87(10×9)x = \frac{87}{(10 \times 9)}x=8790x = \frac{87}{90}
  8. Find GCD and Divide: We can simplify the fraction 8790\frac{87}{90} by finding the greatest common divisor (GCD) of 8787 and 9090 and dividing both the numerator and the denominator by the GCD.\newlineThe GCD of 8787 and 9090 is 33.
  9. Final Simplified Fraction: Divide both the numerator and the denominator by the GCD:\newlinex=(87÷3)/(90÷3)x = (87 \div 3) / (90 \div 3)\newlinex=2930x = \frac{29}{30}\newlineThis is the fraction in its simplest form.

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