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Homework Help: Highest Common Factor and Lowest Common Multiple

  1. Jun 4, 2012 #1
    Highest Common Factor and Lowest Common Multiple of 4 , 6 , 8 , 18


    HCF

    4 = 2.2
    6 = 4.2
    8 = 4.2
    18 = 2.9

    HCF = 2 ???

    LCM
    4 = 8 , 12 , 16 , 20 , 24 , 28 , 32 ... 72
    6 = 12 , 24 , 32 , .... 72
    8 = 16 , 24 , 32 ... 72
    18 = 36 , 54 , 72

    LCM = 72 ??
     
  2. jcsd
  3. Jun 4, 2012 #2

    Mentallic

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    Homework Helper

    Yes the HCF = 2, but what are those other numbers on the right side? 2.2, 4.2?
    You should also be able to tell that the HCF is 2 simply because the difference between 4 and 6 or 6 and 8 is 2, and they're even, so logically you should come to that conclusion.

    Yes, and notice that 8 is a multiple of 4, and 18 is a multiple of 6, so it would suffice to just find the LCM of 8 and 18.
     
  4. Jun 4, 2012 #3
    Thanks :)
     
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