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    #55390 - 09/14/09 07:00 PM Help - 5th grade math problem
    JDAx3 Offline
    Member

    Registered: 03/11/09
    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?

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    #55391 - 09/14/09 07:05 PM Re: Help - 5th grade math problem [Re: JDAx3]
    LMom Offline
    Member

    Registered: 12/14/07
    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

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    #55393 - 09/14/09 07:09 PM Re: Help - 5th grade math problem [Re: LMom]
    Nautigal Offline
    Member

    Registered: 04/22/09
    Posts: 1012
    That's what I would do, but I have no idea how 5th grade math teachers might do it these days.

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    #55394 - 09/14/09 07:10 PM Re: Help - 5th grade math problem [Re: LMom]
    CAMom Offline
    Member

    Registered: 08/13/08
    Posts: 745
    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

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    #55395 - 09/14/09 07:12 PM Re: Help - 5th grade math problem [Re: LMom]
    JDAx3 Offline
    Member

    Registered: 03/11/09
    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!

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    #55397 - 09/14/09 07:13 PM Re: Help - 5th grade math problem [Re: CAMom]
    EandCmom Offline
    Member

    Registered: 11/09/07
    Posts: 516
    Cross multiplication is the way my child was taught in 5th grade. Just like CAMom said.

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    #55399 - 09/14/09 07:17 PM Re: Help - 5th grade math problem [Re: CAMom]
    JDAx3 Offline
    Member

    Registered: 03/11/09
    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!

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    #55403 - 09/14/09 07:44 PM Re: Help - 5th grade math problem [Re: JDAx3]
    Nautigal Offline
    Member

    Registered: 04/22/09
    Posts: 1012
    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

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    #55405 - 09/14/09 07:46 PM Re: Help - 5th grade math problem [Re: Nautigal]
    EandCmom Offline
    Member

    Registered: 11/09/07
    Posts: 516
    It is learned in 5th grade! smile Or at least my child learned it in 5th.

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    #55407 - 09/14/09 07:47 PM Re: Help - 5th grade math problem [Re: Nautigal]
    CAMom Offline
    Member

    Registered: 08/13/08
    Posts: 745
    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.

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