Got any tips on finding percentages of a number?

Having a tough time remembering how to find the percentage of a number? Try turning the question word-for-word into an equation.

For what, substitute the letter x; for is, substitute an equal sign; for of, substitute a multiplication sign. Change percents to decimals or fractions, whichever you find easier. Then solve the equation.

Example: 18 is what percent of 90?

18 = x(90)
18/90 = x
1/5 = x
20% = x

Example: What is 15% of 60?

x = .15(60) = 9
or
x = 15/100 x 60 = 900/100 = 9