Practice factoring trinomials with this decoder where you can check your answers while you work to make sure you are on the right track. This decoder includes factoring practice with the coefficient equal to 1, factoring a GCF first, and the coefficient greater than 1. Once students factor the trinomial they must find their answer on the right and place the corresponding letter on the lines at the top of the page. Once students complete all factoring problems they will decode the message "I like that boulder. That is a nice boulder" from the movie Shrek.