GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 18 Nov 2018, 02:15


GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

for You

we will pick new questions that match your level based on your Timer History

Your Progress

every week, we’ll send you an estimated GMAT score based on your performance


we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.


Request Expert Reply

Confirm Cancel
Events & Promotions in November
Open Detailed Calendar
  • How to QUICKLY Solve GMAT Questions - GMAT Club Chat

     November 20, 2018

     November 20, 2018

     09:00 AM PST

     10:00 AM PST

    The reward for signing up with the registration form and attending the chat is: 6 free examPAL quizzes to practice your new skills after the chat.
  • The winning strategy for 700+ on the GMAT

     November 20, 2018

     November 20, 2018

     06:00 PM EST

     07:00 PM EST

    What people who reach the high 700's do differently? We're going to share insights, tips and strategies from data we collected on over 50,000 students who used examPAL.

Strategy for Picking Numbers on "Number property"

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message

Hide Tags

Senior Manager
Senior Manager
User avatar
Joined: 17 Jul 2007
Posts: 281
Location: The 408

Show Tags

New post 30 Jul 2007, 09:28
some great advice in this thread!
Joined: 11 Sep 2006
Posts: 509
one more value to test...  [#permalink]

Show Tags

New post 04 Oct 2007, 10:10
Sometimes it is very useful to try a square root, in addition to fractions, etc. I got tripped up on this in OG. Question asked whether "n" was an integer. One of the statements said "n^2 is an integer". So I thought I was safe saying it was sufficient. But no. As was pointed out to me in this forum, what if n = ^2? Then n^2 would still be an integer, but n would not.

...there ain't no such thing as a free lunch...

Joined: 13 Jan 2009
Posts: 162
Schools: Harvard Business School, Stanford
Re: Strategy for Picking Numbers on "Number property"  [#permalink]

Show Tags

New post 20 Aug 2009, 00:42
Good tips, thanks everyone!
Joined: 25 Dec 2009
Posts: 78
Re: More tips  [#permalink]

Show Tags

New post 11 Jan 2010, 08:05
Srinivas wrote:
1. Watch for |X|, GMAT likes questions involving modulus.

2. In general, X^^2 is greater than X. However, if X is a fraction between 0 and 1, any higher (n greater than or equal to 2) powers of X ie X^^N < X i.e. X is bounded with in 0 and 1. i.e. 0 < X < 1.

3. Note that 2 is a very special number. It is an even number and also a prime number. When plugging in numbers for a problem involving prime numbers, usually we think of odd numbers but not 2. Note that GMAT is setting up a trap for you.

4. Note that the inequality changes when multiplied by negative numbers.

eg: X < 2 implies -2X > -4

By multiplying by -2, the inequality has changed.
However, multiplying by a positive number, the inequlity does not change.

For example, if X < 2 then 3 X < 6.

5. If the problem involves 3 consecutive integers, you might want to try n-1,n,n+1. Note that the sum of 3 consecutive integers, in this case is 3n. So, you can see right away that irrespetive of what n is, a sum of three consecutive integers is always divisible by 3.

6. Translate information in the question into equations and vice versa.

i.e. As already posted by someone, if y is a factor of x, x/y = integer.
Write this down on the scratch paper so that you know you need to include this information to solve the problem.

Another example is, if the problem says, x and y are positive integers, write it down as x > 0, y > 0.

7. Note the following simple facts:

sum, product or difference of two even numbers yields an even number.

Sum and difference of two odd numbers is Even.
product of two odd numbers is Odd.

sum or difference of an odd and even number is odd.
Product of an odd and even number is Even.

8. Know the difference between a factor and a multiple. Do not get confused.

9. Note that for any real number x not equal to zero, x ^^ 2 is always positive.

10. Even though X^^2 = 16 has two solutions, X^^3 = 8 has only one real solution. i.e. X ^^3 = 8 does not mean x is either 2 or -2. NO. X is 2.


1. statement 1 : X^^2 = 4, Statement 2: X^^3 > X Answer C.

2. Statement 1: X^^3 = 8, statement 2: X^^3 > X. Answer A.

11. As already posted earlier, test some critical conditions such as

x=even and odd
x=fraction between 0 and 1

12. Note that 2 independent equations are needed to solve for x and y. GMAT likes to set up a trap where Statement 1 and Statement 2 appear to provide two equations. So, it is natural to pick answer C thinking that two equations and two unknown. Write down the equations. In some cases, both statements 1 and 2 might give you the same equation. In other words, you will end up with only one equation to solve for x and y. So, in this case the answer should be E.

13. Do not assume any information that is not provided.

For example, GMAT tries to set you up by saying x,y,z are three consecutive integers. This does not mean

x<y<z or x>y>z unless otherwise stated.


When there are three consecutive integers , there are two cases .. 2, 3, 4 or -4 ,-3,-2 so generally speaking, x<y<<z . Can we consider the case 4,3,2 as well as consecutive integers?

OG 12 clearly states that

"The numbers -2, -1, 0, 1,2,3,4,5 are consecutive integers. Consecutive integers can be represented
by n, n + 1, n + 2, n + 3, ... , where n is an integer. The numbers 0, 2, 4, 6, 8 are consecutive even
integers, and 1, 3, 5, 7, 9 are consecutive odd integers. Consecutive even integers can be represented
by 2n, 2n + 2, 2n + 4, ... , and consecutive odd integers can be represented by 2n + 1, 2n + 3,
2n + 5, ... ,where n is an integer."

Am I wrong ?
Joined: 26 Dec 2009
Posts: 88
Location: United Kingdom
Concentration: Strategy, Technology
GMAT 1: 500 Q45 V16
WE: Consulting (Computer Software)
Re: Strategy for Picking Numbers on "Number property"  [#permalink]

Show Tags

New post 11 Jan 2011, 12:44
thanks. great stuff. :)
Joined: 05 Jan 2011
Posts: 3
Re: Strategy for Picking Numbers on "Number property"  [#permalink]

Show Tags

New post 13 Jan 2011, 22:51
Very good post, Srinivas. Thanks for all the great information
Joined: 03 Mar 2014
Posts: 11
Re: Strategy for Picking Numbers on "Number property"  [#permalink]

Show Tags

New post 06 Mar 2014, 15:35
Great tips Paul & Srivinas!
Veritas Prep GMAT Instructor
User avatar
Joined: 16 Oct 2010
Posts: 8550
Location: Pune, India
Re: Strategy for Picking Numbers on "Number property"  [#permalink]

Show Tags

New post 06 Mar 2014, 18:30
Here are some posts discussing efficient number picking: ... game-plan/ ... culations/ ... on-points/ ... on-points/

Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

GMAT self-study has never been more personalized or more fun. Try ORION Free!

Non-Human User
User avatar
Joined: 09 Sep 2013
Posts: 8807
Premium Member
Re: Strategy for Picking Numbers on "Number property"  [#permalink]

Show Tags

New post 06 Sep 2018, 08:59
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).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

GMAT Club Bot
Re: Strategy for Picking Numbers on "Number property" &nbs [#permalink] 06 Sep 2018, 08:59

Go to page   Previous    1   2   [ 29 posts ] 

Display posts from previous: Sort by

Strategy for Picking Numbers on "Number property"

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.