Different problems will be hung around the room. The answer to the problem the students choose to solve will be in the upper left hand corner of another problem. Students will then do the problem that is on the card with their answer to the previous problem. They will continue around the room until they end up back in the same spot they started. This around the room is lengthy so you may want to plan for 2 class periods or just assign them a portion of the problems. Key is attached. When checking, start at the answer they first found and it will go in order from there.