Best Answer

Answer: 3

Definition: A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that the numbers have in common.

Method:

One way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.

The factors of 15 are 1, 3, 5, and 15.

The factors of 21 are 1, 3, 7, and 21.

The factors of 27 are 1, 3, 9, and 27.

The common factors are 1 and 3. Therefore, the greatest common factor is 3.

Q: What is the greatest common factor of 15 21 and 27?

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The GCF is 3.

The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.

The greatest common factor of 21 and 75 is 3.

The greatest common factor of 21 and 322 is 7.

The greatest common factor of 105 and 147 is 21

Related questions

The Greatest Common Factor of 15, 21, 28: 1

what is the greatest common factor of 9,15,and 21

It is: 1

1

The greatest common factor of 15 and 21 is 3The factors of 15 are: 1, 3, 5, 15The factors of 21 are: 1, 3, 7, 21The common factors are: 1, 3The Greatest Common Factor (GCF) is: 3

The greatest common factor of 6, 15 and 21 is 3. The prime factorization of 6 is 2*3 The prime factorization of 15 is 3*5 The prime factorization of 21 is 3*7 The GCF is then 3, as it is the only common factor.

The GCF is 3.

The GCF is 3.

The GCF is 1.

The GCF is 3.

The GCF is 1.

The greatest common factor of 21 and 77 is 7.