GMAT Prep Essentials From Khan Academy

The Khan Academy Fundamental GMAT Quant Curriculum



Adding and Subtracting Fractions

Multiplying and Dividing Fractions

Converting between Decimals and Fractions

Mixed Numbers and Improper Fractions

Comparing Fractions

Long Division with and without Remainders


Prime Factorization and Divisibility

Least Common Multiple

Greatest Common Divisor

Unit Conversion


Exponents, Square Roots, and Scientific Notation




Systems of Equations




Line Segments, Angles, Triangles, 3D Shapes (you can safely ignore cones and the surface area of a cylinder)



Basic Coordinate Plane

Equations of a line (Don’t worry about memorizing point slope form or standard form)

Slope Intercept Form



Mean, Median, Mode


Other Helpful Topics

Number Properties

Basic Combinations/Permutations

Basic Probability

Andrew Geller of Atlantic GMAT

Andrew Geller of Atlantic GMAT

Andrew Geller a GMAT expert who scored an impressive 770 on the exam. Unlike some of the nerdy GMAT tutors out there, Andrew can actually write. He’s been teaching since 2002 and throughout the past decade has worked for various big and small test prep companies helping people succeed on the GMAT, LSAT, SAT, ACT, and GRE. Throughout his career he has successfully taught people from many different backgrounds, countries, and starting scores.

He now leads Atlantic GMAT, a company which he founded to provide a creative and nuanced approach to GMAT preparation especially for students who have struggled to achieve their GMAT goals through big box test prep. Andrew is answering any of your GMAT questions on Poets&Quants here.

In his spare time, Andrew likes to play music, ride his motorcycle to the beach, play ping pong, and ski. Andrew spent a year teaching English in Brazil and is fluent in Portuguese.



  • Karel Koes Hiranjgarbh Missier

    Absolutely, good luck ! Karel Koes Hiranjgarbh Missier Paragh

  • Hi Amit,

    Thanks for pointing that out. I think those explanations can be helpful. One thing to note though: the Khan GMAT explanations tend to plow through the questions without always considering the best way of getting to the solutions (I prefer using Khan for basic content, it’s great for teaching the fundamentals). So, yes, these explanations illustrate one way of solving the questions but I would recommend getting a second opinion from the GMAT forums. It’s good to see questions solved a few different ways anyways. Seeing these different perspectives can really flesh out the underlying concepts.

    Happy Studies,


  • amit

    there is also a gmat prep section where khan goes through the GMAT 11th edition, 2005, problem solving and data sufficiency tutorial of each problem.

  • Hi Andrew,

    Thanks for sharing. Excellent work on your GMAT studying! Agreed – Khan is a great resource for getting your math skills back. That’s good to know that you found success with some of the more specific question tutorials. Maybe there can be a “part II” of this GMAT Khan Academy list highlighting some of the more advanced Khan Academy lessons involving strategies for solving specific GMAT questions types such as rates and work. Best of luck with your GMAT studying and certainly post any GMAT questions that you have.

  • JohnAByrne

    Thanks Andrew. Really appreciate it.

  • Andrew

    Hi John,


    I found the tutorials on word problems to be useful. They are similar to GMAT IR questions. Also, for some reason I had consistent difficulty with rate and work problems, both of which are explained on the site. I would also recommend expressions with unknown variables, they resemble a lot of the voodoo mind tricks you find on the problem solving portion of the GMAT.

    A few things beginners should keep in mind about Khan academy:

    It allows the user to select which broad topic to test on. At the start menu, you’ll be able to select whether you would like to study Arithmetic, Algebra I, Algebra II, Geometry, or Probability and Statistics. There are other categories, but those five are the most relevant to the GMAT.

    Alternatively, you can select “world of math”. This is more of a potpourri category that will test the user on a range of questions from the categories listed above, much like the actual GMAT.

    Additionally you can have a “coach” sign up to monitor your progress. I find that I do much better when I am being judged, so having a friend act as coach has been very useful to me.

    Above all, I have benefited from the constant testing. My math anxiety level has come down drastically over the past couple months. I no longer panic when I see a problem I’m unfamiliar with, now I apply problem solving techniques that the software has taught me.

    Good luck studying!

  • Matt

    Good luck on your GMAT!

  • JohnAByrne


    Thanks much for weighing in. Can you recommend specific Khan Academy lectures that we neglected to mention?



  • Andrew

    I’d like to make a quick endorsement.

    I’ve been using Khan academy over the past two months to prepare for the GMAT. It is AMAZING!

    My first practice exam (prior to Khan academy) was a 500. After a month with Khan academy I shot up to 640. I have 2.5 months until I take the exam and I am super confident that I will hit 700+.

    Khan academy is probably the single best tool you can use to brush up on high school and college math. I can’t recommend it enough. Not just for the GMAT but the other videos on finance, history, astronomy. They are all excellent.

    Check it out!