Try to make sure that two weak students are not paired. Each student in a pair will select to be either number one or number two. Each pair should sit together, with the other pair that completes their team either behind or in in front of them. Student working a problem explains his method to his partner. When number one's problem is complete, the paper is passed to number two.
Number twos work their problem while number ones coach.
Coach should praise when partner completes the problem. Once the pair has completed one problem each, they turn to check their answers with the other pairs in the team. If students agree, celebrate with a high five or team handshake. Then, go to the next problem. Repeat until done or time is called.