Back at the beginning of August, I wrote about using pentominoes on the first day of math class . I used this activity again today, on the first day of math with my new classes, and I am so glad that I did! I was again so impressed with the way the students worked together and were so persistent in trying to make that rectangle! I did give the class a hint after about 10 minutes or so, showing them the 2 pentominoes that go at the top of the rectangle. I have a magnetic set that I can use on the blackboard, which is pretty handy. In all classes, we spent about 20-25 minutes working on the task, which was longer than last year, I believe. And, I think I waited a little longer this year before giving them any hints, because we had more time. In my first two classes, only one group finished (after using the hint....or two), and they finished at the very end of the period. In my 3rd and 4th classes, a group finished early enough to go around to the other groups and offer them help.