To find the GCF of any two numbers, you need to figure out what numbers each have in common, then you choose the largest one that each have in common as the GCF. In this case: 15: 1, 3, 5, 15...then you have 22: 1, 2, 11...Not really much in common except the number 1; that is your GCF in this case. Good luck!
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The GCF is 1.
22
Find out all the factors and then find the greatest common factor (gcf)...........very easy
The GCF is 22.
Any two composite numbers who do not share the same prime factors.15 = 5x322 = 11x2So 15 and 22 have a GCF of 1