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Number Properties?

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Intern
Joined: 11 Feb 2018
Posts: 1

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11 Feb 2018, 16:27
So, I blew through Kaplan, Pearson, Manhattan and the official GMAT prep guide -- I was scoring 83%+ on Quant quizzes and practice exams, but I get to the test center and I get questions like nothing I've studied. Absolutely no geometry, no angles, no rates, no stats. I mostly got number property questions ("If X is a three digit prime number with the units digit being a factor of 7, how many possible numbers are there for X?..." -- not looking for an answer, just an example of phrasing.)

I haven't encountered anything like this in my test prep... Any suggestions on how to study/learn about stuff like this? I plan on taking it again... maybe I just got unlucky with the questions? Anyone else have a similar experience?
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Joined: 17 Jun 2016
Posts: 499
Location: India
GMAT 1: 720 Q49 V39
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12 Feb 2018, 05:00
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jhh852 wrote:
So, I blew through Kaplan, Pearson, Manhattan and the official GMAT prep guide -- I was scoring 83%+ on Quant quizzes and practice exams, but I get to the test center and I get questions like nothing I've studied. Absolutely no geometry, no angles, no rates, no stats. I mostly got number property questions ("If X is a three digit prime number with the units digit being a factor of 7, how many possible numbers are there for X?..." -- not looking for an answer, just an example of phrasing.)

I haven't encountered anything like this in my test prep... Any suggestions on how to study/learn about stuff like this? I plan on taking it again... maybe I just got unlucky with the questions? Anyone else have a similar experience?

First thing first :
Here is the link to the post talking about the overview of the topics and their history on GMAT : https://gmatclub.com/forum/overview-of- ... 11809.html

this is will give u an idea about where you should be focusing more on during ur preparation stage.

Now, regarding the concept of number properties, I have gone through many books but I feel the most comprehensive is this one here : https://gmatclub.com/forum/gmat-math-book-87417.html
(Click on the link to Number Properties in that post).

You can practice such questions here : https://gmatclub.com/forum/search.php?s ... mit=Search
and here :
https://gmatclub.com/forum/search.php?s ... mit=Search

Hope that will resolve ur problem.
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Joined: 04 Dec 2015
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GMAT 1: 790 Q51 V49
GRE 1: Q170 V170

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19 Feb 2018, 11:00
That's an interesting experience. I'm not 100% sure, but I'd guess that there are two factors at play here:

1. You got unlucky. The exact number of Quant questions of each type of math isn't set in stone; it's possible to get more questions of one type and fewer of another type. I imagine it's also possible to get a question that's technically counted as one type, but has aspects of another type - many problems test more than one math concept, especially when you're doing tough problems.

2. Number Properties is a weakness for you. If a problem type totally baffles you, it makes it stand out more, which can make it feel as if there were way more problems of that type than there should have been. My understanding is that the GMAT takes content area into account when picking questions to give you - that is, if you've already seen a lot of Geometry problems, it's less likely that your next problem will be Geometry, even if the problem that the algorithm says is technically the best one is still a Geometry problem. I don't know much about what's going on under the hood, specifically - the GMAC won't tell us - but it shouldn't be possible to get a really 'bad' GMAT that only tests one area.
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Joined: 28 Feb 2012
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Location: United States (WA)
Concentration: Technology, Finance
GMAT Date: 06-01-2012
GRE 1: Q780 V500
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26 Feb 2018, 00:50
This is definitely surprising. I have taken a few tests, but I havent seen this issue. However, MGMAT number properties book has "few" examples of these and I am sure you can find a bunch of topics/questions here too.
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30 Aug 2019, 02:06
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Number Properties?   [#permalink] 30 Aug 2019, 02:06
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