Find all School-related info fast with the new School-Specific MBA Forum

It is currently 02 Sep 2014, 01:19

Close

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.

Customized
for You

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

Track
Your Progress

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

Practice
Pays

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Rounding up or rounding down

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 15 May 2008
Posts: 19
Followers: 0

Kudos [?]: 3 [0], given: 0

Rounding up or rounding down [#permalink] New post 20 Sep 2010, 11:55
Hello,

I am not 100% sure whether to round up an integer, say 2.5, to 3.0 or round down to 2.0. And what should happen in case of -2.5?
Does such situation occur on GMAT?

Please respond.
Kaplan GMAT Prep Discount CodesKnewton GMAT Discount CodesManhattan GMAT Discount Codes
Current Student
User avatar
Joined: 16 Sep 2010
Posts: 227
Location: United States
Concentration: Finance, Real Estate
GMAT 1: 740 Q48 V42
Followers: 7

Kudos [?]: 58 [0], given: 2

GMAT Tests User
Re: Rounding up or rounding down [#permalink] New post 20 Sep 2010, 12:18
I always adhere to the rule of 5, if its .5 or above you round up. This is obviously inverse for negative numbers.

You may encounter this but its unlikely as most interaction with strictly integers is limited to data sufficiency and you do not need to actually solve these only prove that they can be solved.
Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 25239
Followers: 3430

Kudos [?]: 25245 [0], given: 2702

Re: Rounding up or rounding down [#permalink] New post 20 Sep 2010, 12:32
Expert's post
Rounding is simplifying a number to a certain place value. To round the decimal drop the extra decimal places, and if the first dropped digit is 5 or greater, round up the last digit that you keep. If the first dropped digit is 4 or smaller, round down (keep the same) the last digit that you keep.

Example:
5.3485 rounded to the nearest tenth = 5.3, since the dropped 4 is less than 5.
5.3485 rounded to the nearest hundredth = 5.35, since the dropped 8 is greater than 5.
5.3485 rounded to the nearest thousandth = 5.349, since the dropped 5 is equal to 5.

So 2.5 rounded to the nearest integer equals to 3.

As for rounding negative numbers: you won't need this for GMAT, so don't worry about it.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Intern
Intern
avatar
Joined: 15 May 2008
Posts: 19
Followers: 0

Kudos [?]: 3 [0], given: 0

Re: Rounding up or rounding down [#permalink] New post 20 Sep 2010, 13:25
Thanks u0422811 and Bunuel.
Manager
Manager
avatar
Joined: 04 Aug 2010
Posts: 158
Followers: 2

Kudos [?]: 23 [0], given: 15

GMAT Tests User
Re: Rounding up or rounding down [#permalink] New post 20 Sep 2010, 13:58
I believe the official rule of gmat is to round up if its .5 or above and down if its .4 or below. Though one must be carefull in some instances where you must round down at all times. For example if the question asks the number of people that can fit into a room, and your calculation gives 11.9, the answer would be 11 rather than 12.
Manager
Manager
avatar
Joined: 30 May 2010
Posts: 191
Followers: 3

Kudos [?]: 41 [0], given: 32

GMAT Tests User
Re: Rounding up or rounding down [#permalink] New post 20 Sep 2010, 14:55
The GMAT will occasionally give a crazy rule for rounding, and say any number [x] should always be rounded up/down. They usually rely on "tricking" you on negative numbers. When rounding up/down on a negative number, it may be helpful to visualize the number line to make sure you are rounding in the right direction!
Re: Rounding up or rounding down   [#permalink] 20 Sep 2010, 14:55
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Rounding up or rounding down mandhan 5 20 Sep 2010, 11:55
4 Round up? Ludacrispat26 11 15 Sep 2010, 14:23
Experts publish their posts in the topic A swimmer makes a round trip up and down the river. It takes JDMBA 5 11 Nov 2007, 12:08
A swimmer makes a Round trip UP and DOWN the river. It takes Ozmba 2 09 Nov 2007, 08:37
A swimmer makes a round trip up and down the river. It takes IrinaOK 16 11 Oct 2007, 18:49
Display posts from previous: Sort by

Rounding up or rounding down

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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

Powered by phpBB © phpBB Group and phpBB SEO

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®.