How do write 0.72 repeating as a fraction?

You need to call your number "x", then write the following two equations:(Equation 1) x = 0.727272...

Multiplying by 100, you get:

(Equation 2) 100x = 72.727272...

If you subtract equation 1 from equation 2, and solve for "x", you will get the number as a fraction.