what is the gcf of 15 and 30

The greatest common factor (GCF) of 15 and 30 is 15. This means that 15 is the largest positive integer that divides both 15 and 30 without leaving a remainder. There are several methods to find the GCF of 15 and 30, including prime factorization, listing common factors, and long division. By using any of these methods, it can be determined that the GCF of 15 and 30 is 15.