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Highest common factor

Discussion in 'Personal' started by Doglover, Apr 6, 2011.

  1. My daughter has to work out the highest common factor of 50 and 125.
    She has to do little diagrams breaking down the 50 and then 125.
    So we get - 50 = 2 x 5 squared and 125 = 5 cubed.
    The next stage is confusing us.
    According what she has been shown the HCF = 2 x 5 squared, but that equals 50 :/
  2. bombaysapphire

    bombaysapphire Star commenter

    The HCF is the factors which they share which is just 5 squared = 25.
  3. 50 = 2 x 2 x 5 x 5

    125 = 5 x 5 x 5

    Look for what they have in COMMON

    5 x 5

    So HCF = 25
  4. oops ... just ignore the extra 2

    50 = 2 x 5 x 5
    The rest was ok though [​IMG]
  5. Ahh, I think I see now......
  6. So - 98 and 147
    The HCF = 2
    I think I misinterpreted what she was told to do, and I mean you couldn't expect her to remember what she was told :p
  7. no

    98 = 2 x 7 x 7

    147 = 3 x 7 x 7


    7 x 7

    HCF = 49
  8. doomzebra

    doomzebra Occasional commenter

    The highest common factor of 50 and 125 is 25
    (what is the highest common number by which both 50 and 125 can be divided to give a whole number)
  9. Oops I did that wrong![​IMG]
  10. What's the biggest number that goes into them both, innit?
    *Disclaimer: I is **** at Maths.
  11. Yes, but Doglover's daughter needs a method for finding HCF
  12. doomzebra

    doomzebra Occasional commenter

    doan go dissin yesself Miss Lily, you 'as mad maths skills
  13. That is how I do Maths.
    No system. But I get there. Eventually.

  14. But Lily and me don't get the method.

  15. RF - do you remember a very long thread with me?
    You very patiently explained...I must have driven you potty.
    I do Maths my way - which is invarioubly the long way round, but it makes sense to me.
    And I get the right answers.
    But it drove my Maths teacher mad.
    I got a B O level.
    So somehow, my skitty methods work.
  16. But Doglover and her daughter will
  17. Yep, but she has been taught a specific method which she has to use, which is what is confusing us.
    I know what factors are, lol, but it's the method and the little tree like diagrams which are confusing :s
    She had to use a similar method to find the lowest common multiple too.
  18. I do not recall it but I am sure you did not drive me potty ... I can usually take a couple of approaches and hopefully get there

    A good move if, as you say, the answer is correct [​IMG]
  19. Sorry crossposted RF ;)
  20. lilachardy

    lilachardy Star commenter

    Tee hee....


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