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

.3 bar(5)
Answer:

Convert the following repeating decimal to a fraction in simplest form.\newline.35 .3 \overline{5} \newlineAnswer:

Full solution

Q. Convert the following repeating decimal to a fraction in simplest form.\newline.35 .3 \overline{5} \newlineAnswer:
  1. Define xx as repeating decimal: Let xx be the repeating decimal 0.30.3 with a repeating 55, so x=0.35555x = 0.35555\ldots We need to find an equation that we can solve for xx that will eliminate the repeating decimal.
  2. Multiply by 1010: Multiply xx by 1010 to shift the decimal point one place to the right, which gives us 10x=3.555510x = 3.5555\ldots\newlineThis will help us set up an equation to eliminate the repeating part.
  3. Multiply by 100100: Multiply xx by 100100 to shift the decimal point two places to the right, which gives us 100x=35.5555100x = 35.5555\ldots\newlineNow we have two equations: 10x=3.555510x = 3.5555\ldots and 100x=35.5555100x = 35.5555\ldots
  4. Subtract equations: Subtract the equation 10x=3.555510x = 3.5555\ldots from the equation 100x=35.5555100x = 35.5555\ldots to get 90x=3290x = 32. This subtraction eliminates the repeating decimal and gives us an equation we can solve for xx.
  5. Divide by 9090: Divide both sides of the equation 90x=3290x = 32 by 9090 to solve for xx, which gives us x=3290x = \frac{32}{90}. Now we have the decimal as a fraction, but it may not be in simplest form.
  6. Simplify fraction: Simplify the fraction 3290\frac{32}{90} by finding the greatest common divisor (GCD) of 3232 and 9090. The GCD of 3232 and 9090 is 22.
  7. Find GCD and divide: Divide both the numerator and the denominator by the GCD (22) to simplify the fraction, which gives us x=(32/2)/(90/2)=16/45x = (32/2)/(90/2) = 16/45. Now we have the fraction in simplest form.

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