Question

How do you convert 3.9 (9 repeating) to a fraction?

Answer 1

`3.9999999......=4=4/1`

Explanation:

Let `x=3.9999999......`

Hence `10x=39.9999999.........`

Subtracting former from latter

`9x=36`

r `x=36/9=4=4/1`