First, we begin by completing a set of notes on the concept. I have a set of digital notes available where we use various methods to help determine the GCF. Popular methods for finding the GCF include the upside-down cake method, factor trees, prime factorization, listing the factors, etc. I typically like to use the upside-down cake method the most, but I give students the option to use whatever method makes the most sense to them. The digital notes I have available include both finding and factoring by the GCF. Click on the image to view more information on the resource.