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1) 12 percent of what is 15? 2) 200 percent of what is 36?

3) Three students in the class received an A on a test.The three students represent 15 percent of the class.How many students are in the class?
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2 Answers

 If the mental math isn't intuitive for you, there's an easy way to remember how to do this. Normally, if you're given a number and have to find a certain percentage of that number, you multiply. For example 35% of 20 would be 20 x .35 = 7. If you're told that the number you're given is a certain percentage of another number and you have to find that number, you're basically doing the previous problem in reverse, so instead of multiplying, you do the opposite operation: divide! 7 ÷ .35 = 20
 
So for your problems:
 
15 ÷ .12 = 125
36 ÷ 2.00 = 18
3 ÷ .15 = 20
1.  125 (125 x .12 = 15)
2.  18  (18 x 2.00 = 36)
3.  20  (20 x .15 = 3)