This is an open activity that requires students to complete error analysis. It can be done as a whole group, or in smaller groups. You create the topic and gather problems for your students. They choose a problem, determine whether they want to get it right or wrong, solve it, and answer questions that require them to think about their thinking with solving the problem. Then, students rotate around the room solving each others' problems. It is a unique way to complete error analysis and allow students to evaluate each others' work.