90
9 x 10
3 x 3 x 5 x 2
90
3 x 30
3 x 3 x 10
3 x 3 x 2 x 5
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90 45,2 15,3,2 5,3,3,2
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.