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.
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The result of dividing 27 and 30 is a fraction. The concept of GCF is not relevant for fractions.
The GCF is 3.
The GCF is 3.
The GCF is 3.
The GCF is of 27 and 87 is 3.The GCF is 3.