SP #6- Unit K Concept 10: Writing a repeated decimal as a rational number using geometric series

For this concept you have to pay most attention to where the numbers come from and why he have the decimal where they do. Like the .18 comes from 4.181818 and it is put over 100 because it's in the hundredths place. The 100 goes down to 99 because you had to subtract 1 from it like its given to us in the equation.