hey guys, getting back into some basic algebra (so hope you don't mind a real newbie) and was doing a factoring tutorial on the web, and came across this. The work for finding the GCF of three terms is shown below. 102k^5m^2 51k^4m 153k^2m^2 First find the GCF of the coefficients: 102 (1, 2, 3, 6, 17, 34, 51, 102) 51 (1, 3, 17, 51) 153 (1, 3, 9, 17, 51, 153) GCF (of coefficients only) = 51 Next find the GCF of the variables: k^5 m^2 k^4 m k^2 m^2 GCF (of variables) = k2m Now multiply the two GCFs GCF of the entire term = 51k^2 m what I don't understand is how the GCF for K is 2. Because 5 is not divisble by 2. So how can that be? here's a link to the page if the above is not clear. http://www.algebrahelp.com/lessons/f...indgcf/pg2.htm Thanks!