The GCF is 5.
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The GCF is: 20
The greatest common factor is 2 and the least common multiple is also 2.
5 and 10 5 and 15 5 and 20
The highest common factor is 5
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.