This activity is to be done in groups of 2 or 3. Students take turns working each exponent problem and write their initial beside the problem they worked. When all exponent problems are evaluated, they bring the sheet to the teacher to be checked. The teacher circles the questions that are not correct. As a team, they go back and look over the circled questions. I do give a reward to the teams that get them all correct, even if they have to look back over some questions.