Each student gets a paper with 8 questions on it; however, they only have to answer 4 questions. They are solving a system of linear equations with graphing or substitution. When finished, they compare their answers with their partner. Each person had different problems but they should end up with the same solution. If they get different answers, the students then work their partners problem to find each other's mistakes.
Combines individual work, self-assessment, and cooperative work. Students can also do other half of worksheet for more practice.