The greatest common factor of 54 , 90 = 18
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The GCF is 3.
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The greatest factor of any number is itself.
The GCF of 54, 90, and 126 is 9
The greatest common factor of 1925 , 90 = 5
The greatest common factor of 24 , 90 = 6