Question

What is 18 expressed as a percent?

Answer 1

The word "percent" means "out of a hundred." Therefore, all you need to do to find out what percent 18 is of 100 is set up a proportion like so.
`(18)/(1)= (x)/(100)`

Answer 2

Your answer would be 18.00%, because 18 is not a decimal, and you add .00 at the end of it to make it an official percent.