Q21. - Algebra 1

Question

Write each repeating decimal as a fraction in the simplest form.

$0.\overline{13}$

Step-by-Step Solution

Answer

The simplest form is $=\frac{13}{99}$.

Step 1. Interpret the notation.

$0.\overline{13}$ means 0.131313…..

Step 2. Assign a variable.

Let N = 0.131313…...

Step 3. Decide by what to multiply.

Since two digits repeat so we multiply each side by 100.

100N = 100(0.131313…..)

100N = 13.131313…..

Step 4. Solve for N.

Subtract N from 100N, so that the repeating part eliminates. 

$$\begin{gathered} 100\mathrm{N}=13.131313\dots . \\ \frac{-\left(\mathrm{N}=0.131313\dots .\right)}{99\mathrm{N}=13} \end{gathered}$$

Then divide each side by 99 and simplify.

$\frac{99\mathrm{N}}{99}=\frac{13}{99}$

$\mathrm{N}=\frac{13}{99}$