Whats the gcf and another sum of 63 + 15

To get the Greatest Common Factor (GCF) of 63 and 15 we need to factor each value first and then we choose all the copies of factors and multiply them:

63: 33 7 15: 3 5 GCF: 3

The Greates Common Factor (GCF) is: 3

yes i did get this of another website cause i didint know how to explain it properly