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# Factors/Multiples

Hi. I'm a new member, pleased to meet you.

Alright. I have worksheets on getting the GCF/LCM of a set of three numbers.

Does anybody know of someplace that has a printable guide to these, like a listing of all factors or multiples up to, say, 100?

I know this is kind of simple math, but still. It would be so much less time-consuming to find a guide to it.
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How about reading a multiplication table backwards?
The key thing is to prime factorize each number.

For GCFs, you have to pull out the most you can of each prime number (the prime has to be in every number, obviously) & this amount has to be in every number. For example, if one number has 2*2, another 2*3, and another 2*4, then you pull out 2*2. When you do this for each prime, you multiply everything you pulled out together.

For LCMs, for each prime you pull out the max amount between all of the numbers. For example, if one number has 2*2, another 2*3, and another 2*4, then you pull out 2*4. When you do this for each prime, you multiply everything you pulled out together.
thanks. I got it done. :)