thaheckster
How do I find the greatest common factor of something like 117 and 195? Whats the easiest way?



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uzma
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write down the prime factors of both
GCF is the product of common factors

3pwood
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List the factors of both numbers
117: 1 3 9 13 39 117
195: 1 3 5 13 15 39 65 195
Biggest one looks to be:
39

thaheckster
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numbers that go into 117?

uzma
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117=3*3*13
195=5*3*13
GCF=3*13=39

thaheckster
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thank you!

thaheckster
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my brain is so slow at this lol

uzma
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u got it? slow or fast doesnt matter much

thaheckster
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so I list all the numbers that can go into 117?

uzma
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once u learn the technique, with practice u would be fast in calculations too

thaheckster
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I have been out of school for awhile

thaheckster
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I hope one day I can grasp this as well as you!