Circuits typically have 8-10 problems. Post the problems around the room. Before class put 2 to 3 copies of each answer on a slip of paper and have students choose one. This will let them know which problem to start first and will ensure only 2 to 3 students will be at the same problem. If the students work the problems correctly, the answers will be posted somewhere around the room and they will end up back where they started once they complete all of the problems.