anonymous
  • anonymous
I need help with lcd!!!!
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
What aspect of the process is confusing you?
anonymous
  • anonymous
The lcd of 1/6 1/10 1/18 1/21????
anonymous
  • anonymous
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.

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anonymous
  • anonymous
With so many different denominators, I recommend the factoring method.
anonymous
  • anonymous
So what are the factors of 6, 10, 18, and 21 (individually).
anonymous
  • anonymous
6 = 2 * 3 10 = 2 * 5 18 = 2 * 3 * 3 21 = 3 * 7 lcd = 2 * 3 * 5 * 3 * 7
anonymous
  • anonymous
1 2 3 6 1 2 5 10 1 2 3 6 9 18 1 3 7 21
anonymous
  • anonymous
find the prime factors of each number and then find the smallest set of common prime factors.
anonymous
  • anonymous
thanks guys you rock!
anonymous
  • anonymous
why is there two threes in the equation?
anonymous
  • anonymous
of 18
anonymous
  • anonymous
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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