**Update 6/8/12: Even better than a cheat sheet– download our free GRE Math Formula eBook!**

Before walking into the GRE, it is a good idea to know the following formulas/tidbits. In fact, not knowing the information below can seriously hurt your chances of answering a question correctly.

At the same time, while this is a very useful cheat sheet, do not just memorize formulas without actually applying them to a question. Often students will see a question and will assume that a certain formula is relevant. This is not always the case. So make sure you practice using the formulas so you will know when they pertain to a question.

Not sure when to use these math formulas? Magoosh GRE prep offers lesson videos and practice questions to help you learn to put these formulas to use. And our Android/iPhone Prep App allows you to access that content on the go.

And now…GRE math formulas!

## Interest

Simple Interest: , where P is principal, r is rate, and t is time

Compound Interest: , where n is the number of times compounded per year

## Work Rates

, where T is the time to completion of a task when two workers are combining effort.

## Sets

## Distance, Rate, and Time

,

## Circles

## Squares

, where s = side

## Rectangles

, where l = length and w = width

## Trapezoids

## Polygons

, where n = # of sides

## The Distance Formula

## Prime numbers and integers

1 is not a prime. 2 is the smallest prime and the only even prime.

An integer is any counting number including negative numbers (e.g. -3, -1, 2, 7…but not 2.5)

## Fast Fractions

i.e.

## Divisibility

3 : sum of digits divisible by 3

4 : the last two digits of number are divisible by 4

5 : the last digit is either a 5 or zero

6 : even number and sum of digits is divisible by 3

8 : if the last three digits are divisible by 8

9: sum of digits is divisible by 9

## Combinations and Permutations

n is the total number, r is the number you are choosing

## Probability

How common are questions pertaining to simple interest interest and common interest in the GRE?

Hi there 🙂 While problems on simple and compound interest aren’t too common, they are topics that can definitely show up in a question or two on the exam.

Hope this helps!

Hello what about conversions? Just took a practice test and needed to know how many ounces in a pound.

Measurement conversions are definitely important too— so much so that Mike did an additional blog post on those entitled “What Unit Conversions Should You Know for the GRE?”

1 pound is equal to 16 ounces

Hi – How about adding exponent formulas, pls?

Hi Robert 🙂

Thanks for your suggestion! You can find the formulas for exponential expressions in our Math Formula eBook. The eBook is a more complete guide to the fundamental concepts that you’ll be tested on during the GRE, so I definitely recommend checking it out 🙂

Hi Chris, are there questions related to interior and exterior angles, circle segments?

1 exterior angle is quality to sum of two interior angles

I think you may have been autocorrected! The exterior angle theorem says that an exterior angle is equal to the sum of the two opposing interior angles 🙂

I have a master degree. Like to pursue with my Phd. How hard is really GRE math. Sometimes I think I am not smart enough for that. I am 40 now and I feel my brain is not quick as before to caluclate something quicky. Please guide a bit.

how come we all have the similar problem and well addressed by Chris. discussion is really helpful. plz keep posting

How am I supposed to calculate interest rates without a calculator that has an exponents key? For example, one of the question asks me to calculate how much does a person have in their account after 2 years if she deposit $10,000 in an account that has 3.95% annual rate, compounding semi-annually.

Normally, I would take 10,000(1.0198)^4 but I’m unable to punch 1.0198^4 into the calculator nor am I capable of manually calculating that in a quick manner.

Hi Kaitlyn,

A good strategy is to enter the number, say 1.0198 and then press (X) and (=). That will give you that number squared. Pressing (X) and (=) again, will give you that number to the 4th power. You can play around with that function to give you other derivations, e.g. 1.0198^6, 1.0198^16, etc.

Hope that helps!

will this strategy work on gre exam too?

Super ! Reassuring. Seeing that I’ve covered all of these, gave me quite a confidence boost. 😀

a truly helpful blog 🙂

thanks a lot on final day of my exam i heleped me a lot .I have scored 164 in quant

Great! Such a score is always a ringing endorsement :)!

Thanks a lot…a very good way to see if we got it all hitting the GRE next this ebooks is just what I needed ..You rock guys

I was confused from where to start and here you are made things a lot easier. Thank you very much.

You are welcome — I’m glad I made things easier for you :).

You have made my life much easier. I cannot remember the last time that I used these equations so when I looked at the practice questions I thought “well this is interesting.”

You are welcome! I’m glad the equations were helpful :).

this sai from hyd . it is good.

could pls send me formula according news gre topics to the mai id;sdnsh950@gmail.com

pls.pls.pls.pls…………..

Hi Sai,

You can just download our math formula ebook:

http://magoosh.com/gre/2012/gre-math-formula-ebook/

Enjoy 🙂

Chris,

I was going over some of the practice problems in the Princeton review and found that the 3D shape problems have specific equations for them, do we need to know those for the GRE?

It would help to know the cube, the sphere, and the cylinder. (Though sometimes a question may even supply the formula for a sphere). There are other shapes such as a cone and a pyramid, which I wouldn’t worry about.

Hope that helps 🙂

Hi I’m taking the gre revised tomorrow. Do we need to know the quadratic formula?

Hi Hamid,

No, you should be fine without knowing the quadratic formula. Granted there may be a question in which the quadratic formula could be used, there are often alternative ways of solving the problem, working backwards from answer choices, etc.

Good luck!

I was searching for GRE maths formula. Chris, Is the list complete and is it that actual GRE maths question will walk around these formulas?

Hi Glory,

Interesting that you ask :). We are coming out with a Math formula e-book in a few weeks! There the formula list will be far more comprehensive than the one above. Stay tuned!

Chris,

Thank you for replying . I would really appreciate if you could post me the compiled eBook at : glorybasumata@hotmail.com

Thank You.

Hi Glory,

Actually, we will have the download link up on the blog in a few short weeks (you can just check back in then :). Also, if you are a Premium Magoosh user the link will automatically show up on your resource page. (You can always check out the free trial version of our product to see how Magoosh can help).

Thanks for your kind help!

Hi Chris,

Is there any intrigation and differentiation match problems in revised GRE exam?

No calculus – nor for that matter trig., logarithms, etc.

Good Job…