The factors of 12 are 1, 2, 3, 4, 6, and 12.
The factors of 20 are 1, 2, 4, 5, 10, and 20.
The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30.
The greatest factor they all have in common is 2.
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Greatest Common Divisor (GCD) for 12 20 is 4.
The GCF is: 20
The greatest common factor is 2 and the least common multiple is also 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 factors of 12 are:1, 2, 3, 4, 6, 12The factors of 20 are:1, 2, 4, 5, 10, 20The common factors are:1, 2, 4The Greatest Common Factor:GCF = 4