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anonymous

  • 5 years ago

whats the easiest way to find the lcm of three numbers?

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  1. anonymous
    • 5 years ago
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    If you give me three numbers I will tell you how I do it.

  2. anonymous
    • 5 years ago
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    6,18,12

  3. anonymous
    • 5 years ago
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    Do you know how to find prime factors? 6 = 2 * 3 18 = 2 * 3 * 3 12 = 2 * 2 * 3 Do you understand this so far?

  4. anonymous
    • 5 years ago
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    yeah like a factor tree?

  5. anonymous
    • 5 years ago
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    Yes... now I circle any number that they all have in common - so put a big circle around one 2 in each of the three

  6. anonymous
    • 5 years ago
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    Now put one big circle around one 3 in each of the three numbers.

  7. anonymous
    • 5 years ago
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    gotcha,

  8. anonymous
    • 5 years ago
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    The circled numbers count once ... what I mean is you have 1 (2) and 1(3) because they were circled and then you have 1 (2) and 1(3) that are not circled so you have 2 * 3 (the circled ones) * 2 * 3 (the uncircled ones) 36

  9. anonymous
    • 5 years ago
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    ok thank you!

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