I created this flash file because students have a difficult time mastering factoring using the trial and error method. Even my lowest student can now factor trinomials! I take my entire class to the computer lab. Everytime they reach a 5 correct (or a multiple of 5 thereafter) they get a chocolate. They all have such a great time, and they master their skills in the process. I am amazed at their speed after a few days. I use it to remediate my lowest students in my one classroom computer. You can even post it online so your students can practice at home.