While searching the various sites containing applets, I found several that I would like to use with my smartboard, but one in particular I found that I really enjoyed was the factor tree applet on the NLVM (National Library of Virtual Manipulatives) site. This applet can be used for several different concepts. It can be used to show prime factorization, to find the GCF or the LCM. It is great because the computer will generate the numbers for you, or you can type in the numbers for students to solve. Not only does it help do the factoring, but you type in the answers to the GCF and LCM and it tells you whether or not you have the correct answer.

http://nlvm.usu.edu/en/nav/frames_asid_202_g_3_t_1.html?from=category_g_3_t_1.html