There are four problems on every center. There are 8 centers in the activity. The problems are GCF factoring, Difference of Squares factoring, Trinomial factoring, and Simplifying Rationals by factoring.
I groups students in 3's or 4's to complete this activity. Every student must write every problem in order for the group to get credit. Once the group agrees on an answer, they write the answer on the answer sheet provided (less grading!).
Typically it takes groups 8 minutes to complete each center although some standard and EC classess have needed more time. I post a timer on the SmartBoard and at the end of the time the students pass the center on to the next group. Another strategy is to have the groups actually move themselves, but this only works for my best behaved classes.