Register    Login    Search    Rss Feeds

Forums Home » Ask An Instructor » GMAT Math » Manhattan GMAT Math Strategy Guides


 Page 1 of 1 [ 2 posts ] 



  Print view Print view Previous topic Previous topic | Next topic Next topic
 

Heavy division shortcut

Author Message
smehmood
 Post subject: Heavy division shortcut
 Post Posted: Thu May 26, 2011 11:31 pm 
Offline
Students


Posts: 1
Pg 26, Q6 in the FDP guide is related to heavy division shortcut. The explanation is not very clear, could you please explain the method particulary how do we change the numerator and denominator before the division?
Thanks
Top 
jnelson0612
 Post subject: Re: Heavy division shortcut
 Post Posted: Sat May 28, 2011 7:02 pm 
Offline
ManhattanGMAT Staff


Posts: 1857
Hi there,
Our numbers are as follows:
4,509,982,344
5.342 * 10^4

The first thing we should do is convert the denominator to a real number. 10^4 is 10,000, so 5.342 * 10,000 is 53,420.

Now, let's round the top and bottom numbers so we can easily divide the bottom into the top. I notice that I have a 45 on top and a 5 on the bottom; since 45 is divisible by 5 let's convert every other number to 0.

Thus,
4,500,000,000
50,000

Now you can cross-cancel four zeros on the top and bottom and arrive at 450,000/5, or 90,000.

_________________
Jamie Nelson
ManhattanGMAT Instructor
Top 
Display posts from previous:  Sort by  
 
 Page 1 of 1 [ 2 posts ] 





Who is online

Users browsing this forum: No registered users and 2 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: