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anonymous

  • 5 years ago

I need help with lcd!!!!

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  1. anonymous
    • 5 years ago
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    What aspect of the process is confusing you?

  2. anonymous
    • 5 years ago
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    The lcd of 1/6 1/10 1/18 1/21????

  3. anonymous
    • 5 years ago
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    Ok, so there are a few techniques you can use here. You can either attempt a brute force method of simply listing all the multiples of 6, 10, 18, and 21. You can factorize each of the denominators, see which factors they have in common, then multiply each one by the factors it is missing, etc.

  4. anonymous
    • 5 years ago
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    With so many different denominators, I recommend the factoring method.

  5. anonymous
    • 5 years ago
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    So what are the factors of 6, 10, 18, and 21 (individually).

  6. anonymous
    • 5 years ago
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    6 = 2 * 3 10 = 2 * 5 18 = 2 * 3 * 3 21 = 3 * 7 lcd = 2 * 3 * 5 * 3 * 7

  7. anonymous
    • 5 years ago
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    1 2 3 6 1 2 5 10 1 2 3 6 9 18 1 3 7 21

  8. anonymous
    • 5 years ago
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    find the prime factors of each number and then find the smallest set of common prime factors.

  9. anonymous
    • 5 years ago
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    thanks guys you rock!

  10. anonymous
    • 5 years ago
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    why is there two threes in the equation?

  11. anonymous
    • 5 years ago
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    of 18

  12. anonymous
    • 5 years ago
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    3, 3, 2 are all of the prime factors of 18. basically 3 * 3 * 2 = 18. you have to take them into account when finding the lcd because lcd / 18 should give you a remainder of 0.

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