How to teach factoring to my fifth grader

Discussion in 'General Education' started by cshelz89, Jul 29, 2008.

  1. cshelz89

    cshelz89 Rookie

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    Jul 29, 2008

    My daughter is having trouble learning what factors are of a number. I have gone over it and over it. Do any of you have any tips? She gets upset easily. I am at my wits end.

    Thanks

    If you can give me an example that would be great.
     
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  3. GoldenPoppy

    GoldenPoppy Habitué

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    Jul 29, 2008

    Are you trying to show her with factor trees or with the related multiplication facts?

    I present factors as multiplication facts first:

    15/30 would be written as 3 x 5/3 x 10. We would then write it as 1 x 15/5 x 6 until we had listed all the possible ways that we could make each number. The lists are then put together, so that we would end up with 1, 3, 5, 15 as the factors of 15 and 1, 2, 3, 5, 6,10, 15, 30 as the factors of 30.
     
  4. Loomistrout

    Loomistrout Devotee

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    Jul 29, 2008

    What have you done this far? What can she do correctly?
     
  5. cshelz89

    cshelz89 Rookie

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    Thanks so much! I have not done this way. I like it and she got! :2up:

    Thanks again

    Michelle
     
  6. Lareigna

    Lareigna Companion

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    Jul 29, 2008

    I was just shown the stick method for factoring. Some of my collegues have used this and said it is easier than using a factor tree. Hope this helps.

    EX. factor 18

    Have student list 2, 3, 5, 7, 9, 11... Prime factors at the top of the page.

    Then draw a line, so you have 2 columns (the ! will represent the line)
    18 !

    Start with the 2, how many times does 2 go into 18 - the answer goes on the next line under the 18.
    18 ! 2
    9 !

    Now does the 2 go into 9, no so cross out the 2 and use the next prime number 3. 3 goes into 9...
    18 ! 2
    9 ! 3
    3 !

    Now does 3 go into 3 yep, 1 time
    18 ! 2
    9 ! 3
    3 ! 3
    1 !
     
  7. Andrea L

    Andrea L Habitué

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    I do factoring rainbows. You start with the outer ring of the rainbow being 1 and 30. The next color of the rainbow is 2 and 15. The third color of the rainbow is 3 and 10. The fourth color inside the rainbow would be 5 and 6. It's important to go through every number (even though they may not be factors). I taught my third graders last year this method and they really got it with this method.
     
  8. Upsadaisy

    Upsadaisy Moderator

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    Jul 29, 2008

    How old is your daughter?

    The simplest way to demonstrate factors is with arrays. Use a handful of counters or pennies. To find all the factors, you find all the different ways the counters can be arranged. Ex, for 4 counters, you can make 1 row of 4, or 2 rows of 2. The array must be a rectangle of some sort, with none left over. The various numbers used are the factors. The factors of 4 are 1, 2, 4.

    You can also make the arrays on graph paper.
     
  9. peridotylayne

    peridotylayne Companion

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    Jul 29, 2008

    I LOVE THAT!! I teach my students factors, but we always just made a list. I'm definitely going to try and remember that this year!
     
  10. Andrea L

    Andrea L Habitué

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    Well, I'd love to claim it, but I saw my best friend's son doing it for homework one day. His teacher taught him, but I don't know the name.
     
  11. teacherSMK

    teacherSMK Habitué

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    Jul 30, 2008

    i love the rainbow idea...thx!
     
  12. Ms.Jasztal

    Ms.Jasztal Maven

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    Jul 30, 2008

    I teach the students to make trees of factors, yet I need to find a better way. The rainbow idea seems interesting.
     

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