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LCMs/Adding unlike fractions

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Find the least common multiple in each set of numbers.

1) 8,9,12,18
2) 6,8,9,27,36

I have trouble factoring the denominators in this one.

3/7 + 2/5 + 1/10

  • LCMs/Adding unlike fractions - ,

    try a lcd of 70

  • LCMs/Adding unlike fractions - ,

    The LCM is that smallest whole number that each of your given numbers divide into
    8 = 2x2x2
    9 = 3x3
    12 = 2x2x3
    18 = 2x3x3

    so looking at those, I will need three 2' and two 3's
    LCM = 2x2x2x3x3 = 72

    As to your second one,

    7 = 1x7
    5 = 1x5
    10 = 2x5

    So your lowest common denominator, or the LCM, is
    7x5x2 = 70

  • LCMs/Adding unlike fractions - ,

    I need to rewrite the fractions so that all the denominators are the same.

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