The GCF of 5 and 10 is 5.
The GCF of 4 and 12 is 4.
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The GCF of the numbers is the greatest common factor no matter what their relationship is. When one number is a multiple of another number, the GCF is the smaller number.
The greatest common factors (GCF) of two numbers is one of the numbers when the larger number is a multiple of the smaller number. Examples: The GCF of 10 and 20 is 10 (2 x 10 = 20) The GCF of 29 and 87 is 29 (3 x 29 = 87)
The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You are asking about one number having a GCF!
The GCF is the factor, the LCM is the other one.
The GCF of zero and any other number is the other number.