In this activity students practice solving addition and subtraction one step equations. Students work with a partner to solve fifteen different problems. Problems 1-5 are addition equations, problems 6-10 are a mix of addition and subtraction equations, and problems 11-15 are subtraction equations. Students should get the same answer as their partner for each of the fifteen problems. This ensures students are checking their work and have someone to help them if they are having trouble with a problem.