What is the greatest common factor for 12 and 15?

To find the greatest common factor (GCF) of 12 and 15, follow these steps:

Find the factors of 12: The factors of 12 are the numbers that divide evenly into 12. Factors of 12: 1, 2, 3, 4, 6, 12

Find the factors of 15: The factors of 15 are the numbers that divide evenly into 15. Factors of 15: 1, 3, 5, 15

Identify the common factors: The common factors are the numbers that appear in both lists. Common factors of 12 and 15: 1, 3

Find the greatest common factor: The greatest common factor is the largest number in the common factors list. The greatest common factor (GCF) of 12 and 15 is 3.

So, the greatest common factor of 12 and 15 is 3.