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Homework HELP ME PLEASE!!!!

4th grade math

1. Write two equations that prove the Associative Property is not true for subtraction.

2. Write two equations that prove the Associative Property is not true for division.

 
MamiSanford

Asked by MamiSanford at 9:25 PM on Nov. 17, 2008 in Tweens (9-12)

Level 1 (0 Credits)
This question is closed.
Answers (12)
  • Hope that helps. I went to this website:

    http://math.about.com/od/prealgebra/a/associative.htm

    To get my definition of an Associative Property, they also have some sample problems, that may help you out.
    CarolynBarnett

    Answer by CarolynBarnett at 9:39 PM on Nov. 17, 2008

  • (16-7) - 3= 6
    (7 - 3) - 16 = -12

    :)
    are they in negatives yet or will that give it away that they got help?

    (12/2)/3= 2
    (2/3)/12=0.5555555555555555555555555555555555555555
    Anonymous

    Answer by Anonymous at 9:28 PM on Nov. 17, 2008

  • (8-3)-2=3
    8-(3-2)=7

    (8/2)/2=2
    8/(2/2)=4
    flutterfae

    Answer by flutterfae at 9:31 PM on Nov. 17, 2008

  • oops answer to the 8/(2/2)=8 not 4
    flutterfae

    Answer by flutterfae at 9:32 PM on Nov. 17, 2008

  • No, he is not doing negatives yet.
    MamiSanford

    Answer by MamiSanford at 9:34 PM on Nov. 17, 2008

  • (8-3)-2=3
    8-(3-2)=7

    (8/2)/2=2
    8/(2/2)=8

    :) that help?

    you can actually substitute any numbers in the equations, it won't work out the same #
    flutterfae

    Answer by flutterfae at 9:36 PM on Nov. 17, 2008

  • (4-2)-1=1
    4-(2-1)=3

    (4/2)/1=2
    4/(2/1)=4

    see how it works?
    flutterfae

    Answer by flutterfae at 9:37 PM on Nov. 17, 2008

  • "The addition or multiplication of a set of numbers is the same regardless of how the numbers are grouped. The associative property will involve 3 or more numbers. The parenthesis indicates the terms that are considered one unit.The groupings (Associative Property) are within the parenthesis. Hence, the numbers are 'associated' together. In multiplication, the product is always the same regardless of their grouping. The Associative Property is pretty basic to computational strategies. Remember, the groupings in the brackets are always done first, this is part of the order of operations."

    CarolynBarnett

    Answer by CarolynBarnett at 9:37 PM on Nov. 17, 2008

  • With the above description of an Associative Property, you can clearly see that division ( * is used to demonstrate division here) and subtraction do not hold true to the definition of an Associative Property.




    (2 - 5) - 4 = -7 <----These two problems, if addition, would be equal ----> 2 - (5 - 4) = 1


    (3 * 2) * 4 = 3 3/4 <----These two problems, if addition, would be equal ----> 3 * (2 * 4) = 6
    CarolynBarnett

    Answer by CarolynBarnett at 9:38 PM on Nov. 17, 2008

  • thanks I understand now


    MamiSanford

    Answer by MamiSanford at 9:42 PM on Nov. 17, 2008

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