90
45,2
15,3,2
5,3,3,2
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90 10 9 5 5 3 3
7 is not a factor of 90. It does not divide into 90 evenly.
IT IS PRIME there is no factor tree
Since 18 is a factor of 90 and it is the largest factor of itself, the greatest common factor of 18 and 90 is 18.Since 18 is a factor of 90, it is automatically the GCF.
The factor tree of 50:5025,25,5,25025,25,5,2