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18 = 2x3x3 so the factors of 18 are 1, 2, 3, 6, 9, 18
90 = 2x3x3x5 so the factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
The gcf of 18 and 90 is 2x3x3 = 18
18
The GCF is 18.
The GCF of 54, 90, and 126 is 9
Since 18 is a factor of 90, it is automatically the GCF.
GCF of 36 and 90 is 18
The GCF is: 18