Gifted Bulletin Board

Welcome to the Gifted Issues Discussion Forum.

We invite you to share your experiences and to post information about advocacy, research and other gifted education issues on this free public discussion forum.
CLICK HERE to Log In. Click here for the Board Rules.

Links


Learn about Davidson Academy Online - for profoundly gifted students living anywhere in the U.S. & Canada.

The Davidson Institute is a national nonprofit dedicated to supporting profoundly gifted students through the following programs:

  • Fellows Scholarship
  • Young Scholars
  • Davidson Academy
  • THINK Summer Institute

  • Subscribe to the Davidson Institute's eNews-Update Newsletter >

    Free Gifted Resources & Guides >

    Who's Online Now
    0 members (), 167 guests, and 10 robots.
    Key: Admin, Global Mod, Mod
    Newest Members
    parentologyco, Smartlady60, petercgeelan, eterpstra, Valib90
    11,410 Registered Users
    March
    S M T W T F S
    1 2
    3 4 5 6 7 8 9
    10 11 12 13 14 15 16
    17 18 19 20 21 22 23
    24 25 26 27 28 29 30
    31
    Previous Thread
    Next Thread
    Print Thread
    Page 1 of 2 1 2
    Joined: Mar 2009
    Posts: 247
    J
    JDAx3 Offline OP
    Member
    OP Offline
    Member
    J
    Joined: Mar 2009
    Posts: 247
    I know how I'd work this problem and I know the answer, but I'm not sure what methods are generally used in 5th gr and I don't want to confuse an issue. (btw, it's a bonus question and DS said they didn't go over how to do it.)

    ***About 7/10 of the US population (175,104,000) in 1991 believed saying A to be true. What was the total population?***

    I'm so not good at 'teaching'. Even though I know how to do something, I'm not good at relaying the info in a way that makes sense. Guess I know where DS gets it blush.

    Can anyone offer up 5th grade ideas for how this type of problem is taught?

    Joined: Dec 2007
    Posts: 902
    Member
    Offline
    Member
    Joined: Dec 2007
    Posts: 902
    One of the possible solutions using Singapore math would be

    1) You say that 7 units = 175,104,000

    2) From that you calculate how much 1 unit is

    3) Then you calculate what 10 units are equal to



    LMom
    Joined: Apr 2009
    Posts: 1,032
    N
    Member
    Offline
    Member
    N
    Joined: Apr 2009
    Posts: 1,032
    That's what I would do, but I have no idea how 5th grade math teachers might do it these days.

    Joined: Aug 2008
    Posts: 748
    C
    Member
    Offline
    Member
    C
    Joined: Aug 2008
    Posts: 748
    Does he know how to cross-multiply?

    I'd teach him 7/10=175,104,000/X

    Then you multiply the 10 times the 175,104,000=7 times x

    1,751,040,000=7x

    Divide both sides by 7


    Joined: Mar 2009
    Posts: 247
    J
    JDAx3 Offline OP
    Member
    OP Offline
    Member
    J
    Joined: Mar 2009
    Posts: 247
    Originally Posted by LMom
    One of the possible solutions using Singapore math would be

    1) You say that 7 units = 175,104,000

    2) From that you calculate how much 1 unit is

    3) Then you calculate what 10 units are equal to

    Thanks!! That's about where I was, but I wasn't sure if I was in the general grade area. Oh, and I love the 'teaching' instruction..."you say that 7 units...." LOL, I don't think I could mess this one up.

    Have a great day!

    Joined: Nov 2007
    Posts: 516
    Member
    Offline
    Member
    Joined: Nov 2007
    Posts: 516
    Cross multiplication is the way my child was taught in 5th grade. Just like CAMom said.

    Joined: Mar 2009
    Posts: 247
    J
    JDAx3 Offline OP
    Member
    OP Offline
    Member
    J
    Joined: Mar 2009
    Posts: 247
    Originally Posted by CAMom
    Does he know how to cross-multiply?

    I'd teach him 7/10=175,104,000/X

    Then you multiply the 10 times the 175,104,000=7 times x

    1,751,040,000=7x

    Divide both sides by 7

    Is cross-multiplication learned in 5th grade?? That was my very first thought, but I didn't think I could explain it even though I could do it. (I really have a hard time getting stuff out of my head and on to paper or in words.) I always remember "x over 100 is equal to is over of" from school, but that was many moons ago...

    Thanks!

    Joined: Apr 2009
    Posts: 1,032
    N
    Member
    Offline
    Member
    N
    Joined: Apr 2009
    Posts: 1,032
    I wouldn't have thought cross-multiplication was learned in 5th grade these days, because of what DS7's teacher said to him about simplifying fractions being a 5th grade thing! smile

    Joined: Nov 2007
    Posts: 516
    Member
    Offline
    Member
    Joined: Nov 2007
    Posts: 516
    It is learned in 5th grade! smile Or at least my child learned it in 5th.

    Joined: Aug 2008
    Posts: 748
    C
    Member
    Offline
    Member
    C
    Joined: Aug 2008
    Posts: 748
    I have a distorted frame of reference because my 7th graders used to take full algebra and our 6th graders took pre-algebra. 8th graders all took geometry.

    Page 1 of 2 1 2

    Moderated by  M-Moderator 

    Link Copied to Clipboard
    Recent Posts
    Testing with accommodations
    by aeh - 03/27/24 01:58 PM
    Quotations that resonate with gifted people
    by indigo - 03/27/24 12:38 PM
    For those interested in astronomy, eclipses...
    by indigo - 03/23/24 06:11 PM
    California Tries to Close the Gap in Math
    by thx1138 - 03/22/24 03:43 AM
    Gifted kids in Illinois. Recommendations?
    by indigo - 03/20/24 05:41 AM
    Powered by UBB.threads™ PHP Forum Software 7.7.5