Welcome to the Magoosh GRE Quantitative Diagnostic Quiz!

This quiz has 10 questions; instructions for each prompt will appear above the question.

After you take the quiz, we will email you your results along with custom GRE prep recommendations.

Like the GRE itself, this Diagnostic is challenging. Take a deep breath and do your best.

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Can you explain question 9, please?

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Hi Mina,

I’m going to pass your question on to one of our tutors so that we don’t give the answer away here on the blog 🙂 You should hear from them soon!

Can you provide an explanation for the second problem? If there is already one there, I can’t see it. Thanks

I just did a quick runthrough of the quiz myself, and I can’t see a full explanation for problem 2 either. Sorry about that!

Here is my explanation:

What you’re doing here is averaging the total number of items in two groups, combined. When you do this, the final average will be closest to the average for the larger of the two groups. In this case, the individual group averages are 250,000 for County X and 300,000 for County Y. The combined average for the two groups is 265,000. This is much closer to County X’s 250K average than it is to County Y’s 300K average. So with a combined average so much closer to County X’s original average, County X must have far more “items”– far more houses in this case.

i got 3 scores

i know its not at all good but im ready to improve my score.

can you please provide guidance to improve my score, Chris?

Hi Ankita,

First–the diagnostic test is difficult and it’s meant to challenge you! Many students only get a few correct when they first take it. You should have received recommendations in your email to help you decide how to proceed with your studies! I recommend that you start with our study plans, which will give you a good idea of what you must do to succeed on the GRE! I recommend that you give yourself at least three months to dedicate to your studies. If you are looking for high quality and low cost preparation materials, you should definitely check out our Magoosh Premium Program 🙂

There’s no secret formula that will automatically get you a top score on the GRE. However, with hard work, good strategy and plenty of practice, you will see improvement! I hope this helps 🙂

What’s the estimated score if I got 6/10 correct? Also what does the “Quant Score” mean?

Hi Tamara,

These are not meant to give you an estimated score, but rather to give you a taste of what the quant section is like and where your weaknesses may lie. The “quant score” is just your grouping on this test, so that number is out of 10 questions answered. 🙂

Hi! I got Question 9 wrong and cannot figure out how to approach this problem. Can you please provide an explanation for Question 9? Thank you so much for your help!!!

Hi Chris,

After submitting the test, you should receive an email that provides you with your score and answer explanations for each question. Check for inbox or spam folder to see if you got it! Unfortunately, we can’t provide the answer here because we don’t want to put up any “spoilers” for others who want to take the quiz 🙂

After getting the mail and looking for the solution to Question 9 from it, I failed to find that anywhere.

Hi Richard,

Sorry you haven’t gotten access to your answers yet. That sounds frustrating. 🙁 I see you have a Magoosh GRE Premium account with us. I’ll get Premium support in touch with you via email ASAP.

Have you tried using a practical example? Say you had a square of size 4 and you doubled it to size 8. How much would each of the sides increase in length? If you used the right reasoning, you can see that this applies to any square and determine the exact increase in length.

Can you explain the answer to Question #2? (or tell me where to find it in the paid materials since I’ve paid for the product 😉

Please email help@magoosh.com! Since you’re a premium user, our test prep experts will help you in depth with your question. 🙂

Hi there I just submitted my test after fifnishing all the questions but it is showing ” Error: ERROR ERROR” after I submitted. Will I have to write the test again?

Please email help@magoosh.com and a technical expert will try to help you! 🙂

Question number 3 instructs that I should enter my answer as a fraction. I entered 6/15, which is the correct answer in fraction form, although not simplified. This answer was marked as incorrect. On the actual test, am I required to simplify fractions, even if the question doesn’t state that doing so is required? If my answer would be marked as correct on the actual test, you should consider updating your website to reflect this.

Hi Samantha,

This is an issue with the diagnostic. I will let the team know (but it might not allow for this kind of variance). On the real GRE, you don’t have to reduce as long as you enter a valid fraction! So 6/15 is acceptable and 2/5 is also fine, etc. I hope that clarifies!

I score 10 correct but it gives me 9 points out of 10. Can I please know my approximate math score through this

Hi Shivang,

The GRE Diagnostic test is meant to give you a general sense of what you need to improve and how long you should study, but unfortunately it is not enough information to determine your approximate math score. Magoosh students with Premium accounts have access to a score estimator that helps them to track their progress, but we are only able to estimate this once the student has answered over 100 questions–we need more information about your skills and knowledge first!

However, this high score is a good indicator of success on the quant section. Not many students can achieve such a high score on our diagnostic test, so this means that you are already comfortable with many of the quant concepts that will come up in the GRE. For a more more accurate score prediction, I recommend that you complete one of the free ETS Powerprep tests. It is made by the test-makers, so it gives you the best score prediction possible!

I got a 9 out of 10, but I have a qualm with the phrasing of question 2 (surprising that it’s the question I missed, I know). For this kind of question, wording is important. I often try to simplify “scenario” questions into purely mathematical terms, and I read “the average price of a home in both County X and Y is 265,000” to mean “the price of a home which occupies both counties.”

Speaking in purely logical terms, it now seems obvious that a home cannot be in two counties at the same time, but consider this seemingly similar question:

“The average height of people with green eyes is 62 inches. The average height of people with brown hair is 67 inches. The average height of a person with both green eyes and brown hair is 64 inches. Choose the most appropriate response:

A) The number of people with green eyes is greater

B) The number of people with brown hair is greater

C) The number of people with green eyes is equal to the number of people with brown hair

D) There is not enough information given to determine any of the above.

The proper response to the above question would be D. Wording is very important when constructing and interpreting questions.

Hi David,

I understand your concern here, but we also must use logic to answer these questions. Specifically, the meaning of these questions changes based on the context and information given. In the hair/eyes example, you are not talking about mutually exclusive events. A person can have both green eyes AND brown hair, they can have one feature and not the other, or they can have neither feature. This means that there are people who are included in the green eye group and the brown hair group that are not included in the combined group, which makes it impossible to tell how many people are actually in each group.

In the case of the the home prices, all of the homes are contained in either County X or County Y, and the combined average includes ONLY the houses in County X and Y. There are no homes in either county that aren’t included in the average of either county, or in the combined average. This means that this is a question of weighted averages, and since the combined average price is closer to the average price of County X, (A) is the correct answer.

Again, I can see your point here and I am going to send this question to our content improvement team to see if we can change the wording to “combined” instead of “both”. However, it is likely that you will see questions like this on the GRE that require logical thinking. It’s important to think about the context of the question and consider the logic of the information you are given.

Lol it gave me 9/10 cuz i entered 0.4 instead of 2/5 lol

Hi Moe,

Great job on the 9/10!! Yes, because the question stated “Give your answer as fraction.”, you would need to provide the answer in fraction form to get full marks. Nonetheless, great job! 😀

I know it’s a very rough shot but if you get all 10 correct on this what approximate score would you say on quant?

This is very rough, since it isn’t a full section. But if you got 10/10 you are on track for a 164+ score! 🙂

Thank you! Now I just need to make sure to not put 2*2 as 6… 🙁

How do these questions stack up to the ones on the GRE?

Hi Vandon,

We think they stack up well (and so do our statistical comparisons) but I am letting this question sit for other students to weigh in, too. Their opinions will probably be more valuable for you than ours. 🙂