To divide a fraction by a fraction, multiply the first fraction by the reciprocal of the second one. That means, keep the first fraction the way it is. Change the division to a multiplication. Flip the second fraction.
You can count by powers of 10 to find the power of ten you're looking for. (Ex: I'm looking for 100. So I count by powers of 10. 10,100,1000,10000) and I found it