Question

8TH GRADE MATH ¯\_(ツ)_/¯

What is the fractional equivalent of the repeating decimal n = 0.1515.... ?

Answer the questions to find out.

1. How many repeating digits does the number represented by n have?

2. You need to multiply n by a power of 10 to help you find the fraction. Decide on the power of 10 to multiply by, and tell how you identified that number.

3. Write an equation where the left side is your power of 10 time n and the right side is the result of multiplying 0.1515... by that power.

4. Write the original equation, n = 0.1515... underneath your equation from question 3. Then subtract the equations. Show your work!

5. Write n as a fraction in simplest form. Show your work!​

Answer 1

If n = 0.151515…, then 100n = 15.151515…

Then

100n - n = 15.151515… - 0.151515…

99n = 15

n = 15/99 = 5/33