Group students into pairs, and have them place their desks together in a way that forms a large circle in the classroom (or clearly-defined rows.) Pass out the assignment you want students to complete and have each person in the pair choose to be Partner 1 or Partner 2. Set a timer for an appropriate amount of time for each pair to complete the first question or problem in the assignment, then sound a signal to let all the Partner 2's know to move one seat down the row or clockwise while the Partner 1s stay in place. The new partnerships then work together to solve the next problem. Halfway through the assignment, announce that students should switch roles, and now the Partner 1s will rotate while the Partner 2s stay in place.
Divide students up into teams of 4, and number them off so each person plays the role of Team Member 1,2,3, or 4. Ask a question from the worksheet and provide 30-60 seconds for each group to agree upon an answer. They should ensure every person on the team understands the reasoning, as they won't know which team member will be responsible for answering the question. Then, randomly call out a number between 1 and 4. The person on each team whose number was called writes his or her answer on an individual dry erase board (or sheet of paper). Team members can NOT help in any way, or they will lose a point. On your signal, the designated student holds up his or her board/paper to show the answer, and you (or a student volunteer) can award and record points on the board. When time is up, the team with the most points wins.