List the factors.
1,2,5,10
1,2,3,4,6,12
The common factors are 1 and 2.
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The greatest common factor of 8, 10, and 12 is 2.
2
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 least common factor of any set of integers is 1.
The GCF of consecutive even numbers, like 10 and 12, is 2.