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it is simple. first lets say you have ......... 10 and 15. here is what you do.

list all the ways to make 10 like the example below. then you list all of the ways to make 15. after that well i will show you.

EXAMPLE. 10- 1x10,2x5 1,2,5,10

15- 1x15,3x5 1,3,5,15 the greatest common factor is 5

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12y ago

What else can I help you with?