Short answer: 2
Explanation: Let's factor out the smallest number first. The factors of 12 are 1,2,3,4,6, and 12. Now we'll take the largest of those factors and see if its a factor of the other two. 12 isn't a factor of either, so we'll look at the next biggest and work our way down. 6 is a factor of 18 but not 44 so that's out. 4 isn't a factor of 18. 3 isn't a factor of 44. 2 is a factor of both 18 and 44, so that is our greatest common factor.
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The greatest common factor of the numbers 12, 16 and 18 is 2.
The GCF is 2.
The greatest common factor is 18.
The greatest common factor of 36 and 54 is 18.
The GCF is 3.