What is the greatest common factor of 15 and 100?

Answer 1

One way to determine the 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 100 are 1, 2, 4, 5, 10, 20, 25, 50, and 100.

The common factors are 1 and 5. Therefore, the greatest common factor is 5.

The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.

The prime factors of 15 are 3 and 5.

The prime factors of 100 are 2, 2, 5, and 5.

The prime factors in common are 5, so the greatest common factor is 5.

ANSWER: 5
The GCF is 5.