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# Prime factorization tutorial

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Joined: 25 Aug 2007
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Prime factorization tutorial [#permalink]  17 Oct 2007, 17:54
Hi there -

I'm feeling pretty good about my GMAT quants (test consistently between Q47 and Q49) ... But I want to close the gap because my verbal sucks.

I'm getting killed on prime factorizations - can anyone point me to any good online or offline references?

Thanks!
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Re: Prime factorization tutorial [#permalink]  19 Oct 2007, 02:03
Big-O wrote:
Hi there -

I'm feeling pretty good about my GMAT quants (test consistently between Q47 and Q49) ... But I want to close the gap because my verbal sucks.

I'm getting killed on prime factorizations - can anyone point me to any good online or offline references?

Thanks!

What is exactly your biggest problem with it ? can you post some questions ?

GCF - Greatest Common Factor

Largest possible common factor between numbers

LCM - Lowest Common Multiple

Largest possible common multiple between numbers

To find the GCF/LCM, you will need to do prime-factorization. This means reducing a number to its prime-factor form.

E.g. 1

GCF/LCM of 4,18

4 = 2*2
18= 2*3*3

To find the GCF, take the multiplication of the common factors (pick the lowest power of the common factors) In this case, GCF = 2.

To find the LCM, take the multiplication of all the factors (pick the higest power of the common factors). In this case, LCM=2*2*3*3=36

Re: Prime factorization tutorial   [#permalink] 19 Oct 2007, 02:03
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