1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

Calculate Percent - GMAT and GRE Math

By

Are you preparing for the GRE or the GMAT? If these timed graduate and business school exams are in your future, here's a short cut for answering percent questions. More specifically, this article focuses on how to easily calculate the percentage of a number.

Suppose a question required you to find 40% of 125. Follow these simple steps.

Four Steps to Calculate a Percentage

Step 1: Memorize these percents and their corresponding fractions.

  • 100% = 1
  • 50% = 1/2
  • 25% = 1/4
  • 33 1/3% = 1/3
  • 20% = 1/5
  • 10% = 1/10


Step 2: Choose a percent from the list that fits with the percent in question. For example, if you are looking for 30% of a number, choose 10% (because 10% * 3 = 30%).

In another example, a question requires you to find 40% of 125. Choose 20% since it is half of 40%.

Step 3: Divide the number by the denominator of the fraction.

Since you've memorized that 20% is 1/5, divide 125 by 5.

125/5 = 25

20% of 125 = 25

Step 4: Scale to the actual percent. If you double 20%, then you'll reach 40%.  Therefore, if you double 25, you'll find 40% of 125.

25 * 2 = 50

40% of 125 = 50

Exercises

Answers and Explanations

1. What is 100% of 63?

 



2. What is 50% of 1296?

 



3. What is 25% of 192?

 



4. What is 33 1/3% of 810?

 



5. What is 20% of 575?

 



6. What is 10% of 740?

 


7. What is 200% of 63?

 



8. What is 150% of 1296?

 


9. What is 75% of 192?
 

 


10. What is 66 2/3% of 810?

 

 


11. What is 40% of 575?

 



12.  What is 60% of 575?

 



13. What is 5% of 740?

 

  1. About.com
  2. Education
  3. Mathematics
  4. Math Help and Tutorials
  5. Algebra
  6. Algebra 1 Help
  7. Percent
  8. Calculate Percent - GMAT and GRE Math

©2014 About.com. All rights reserved.