Results 1 to 3 of 3

Math Help - Integers

  1. #1
    Member
    Joined
    Jan 2008
    Posts
    78

    Integers

    Hello, I'm studying for the GMAT and can use all the help i can get. Thank God for you all and the math help forum.

    Here's my question:

    The Product of 26,11,3 is closet to which of the following powers of 10?

    a) 10^4
    b) 10^3
    c) 10^5
    d) 10^2

    I know the answer is b) 10^3, but i had to multiply the entire problem out.

    I wanted to know, is there a short handed way to answer this problem. If so, it'll save me valuable seconds on the GMAT. Any help would be greatly appreciated.

    Thanks,

    Vladimir Berteaux
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Nov 2013
    From
    California
    Posts
    2,760
    Thanks
    1137

    Re: Integers

    Quote Originally Posted by plstevens View Post
    Hello, I'm studying for the GMAT and can use all the help i can get. Thank God for you all and the math help forum.

    Here's my question:

    The Product of 26,11,3 is closet to which of the following powers of 10?

    a) 10^4
    b) 10^3
    c) 10^5
    d) 10^2

    I know the answer is b) 10^3, but i had to multiply the entire problem out.

    I wanted to know, is there a short handed way to answer this problem. If so, it'll save me valuable seconds on the GMAT. Any help would be greatly appreciated.

    Thanks,

    Vladimir Berteaux
    shorter than multiplying 3 small numbers?...

    I guess you could say 26 is close to 25, 11 is close to 10, so it's about 25*10*3 = 750.

    The fastest thing I can think of here is 26 is about 25, 3 is about 4, 11 is about 10, 4x25 is 100 x 10 is 1000 = 10^3
    Last edited by romsek; December 14th 2013 at 12:40 AM.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Member
    Joined
    Jan 2008
    Posts
    78

    Re: Integers

    Yes, questions like this one is put on the GMAT so that you can waste time multiplying, am I right?

    I think theres some rule of 10s that may apply here, am i wrong?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: December 6th 2011, 12:47 AM
  2. Replies: 7
    Last Post: August 3rd 2010, 02:31 PM
  3. Matrix of integers whose inverse is full of integers
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: March 19th 2010, 03:02 PM
  4. Replies: 4
    Last Post: February 24th 2008, 04:08 PM
  5. Replies: 2
    Last Post: October 14th 2007, 04:18 PM

Search Tags


/mathhelpforum @mathhelpforum