I use this fun review activity before tests or quizzes or after I finish a unit. Students are told to form a team of 6 people. These 6 people then sit in a row so that they each are sitting behind one of their own team members. The first person is given the sheet and completes the problem named "Question #1". After they answer it, they pass it back to person 2 and they answer "Question #2" and so on. This continues until the last person answer the last question. Then they pass the paper back up person by person and each person needs to check the work of the person behind them as the paper is passed up. I then check the answers and the first team to have all answers correct receives extra credit or candy. If a question is wrong, that person needs to fix that question. Sometimes, depending on the level of the class, I allow them to ask the person in front of them or behind them to help, or use their notes.