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resilient
- Legendary Member
- Posts: 789
- Joined: Sun May 06, 2007 1:25 am
- Location: Southern California, USA
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I can understand the concept of lcm and gcf by simply drawing out the multipes and seeing where they match.
BUt in the prime factorization way: I get confused on which multiples to eliminate when getting the product of gcf and lcm.
ex. lcm of 18 and 24 - common sense says 72 by looking out at where the mutliples meet. but when seeing harder problems its different you have to look at the prime factors.
18 prime factors are 2,3,3
24 prime factors are 2,2,2,3 and then get the product of the factors. I dont know which factors to eliminate for gcf and lcm. Can someone explain I knew all this but forgot temporarily untill I get your replies.
BUt in the prime factorization way: I get confused on which multiples to eliminate when getting the product of gcf and lcm.
ex. lcm of 18 and 24 - common sense says 72 by looking out at where the mutliples meet. but when seeing harder problems its different you have to look at the prime factors.
18 prime factors are 2,3,3
24 prime factors are 2,2,2,3 and then get the product of the factors. I dont know which factors to eliminate for gcf and lcm. Can someone explain I knew all this but forgot temporarily untill I get your replies.
Appetite for 700 and I scraped my plate!
