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The greatest common factor between two numbers is the biggest number that multiplies into both of them.

Let's factor out 15.

15: 1 x 15, 3 x 5.

Let's factor out 64.

64: 1 x 64, 2 x 32, 4 x 16, 8 x 8.

Both numbers have 1, so the GCF of 15 and 64 is 1.

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GCF stands for Greatest Common factor. The greatest common factor(GCF) of the two numbers 15 and 64 is 1.

What is the greatest common factor?

The greatest common factor or GCF is the common factor between two numbers.

Given to us

15 and 64

We know that the GCF is the common factor between the two numbers, therefore, in order to get the GCF of two numbers, we will write all the possible prime factors of the two numbers,

15  = 3 x 5 x 1

64 = 2 x 2 x 2 x 2 x 2 x 2 x 1

As we can see in the factors of the two numbers, the only common factor between the two numbers is 1.

Hence, the greatest common factor(GCF) of the two numbers 15 and 64 is 1.

Learn more about Greatest Common Factor:

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