In this lesson, students practice all of the problem types they have encountered throughout the year. They discuss their methods for solving the problems and explain their work, including answering such questions as, "How does Student A's work help her solve the problem? How does Student B's work help him solve the problem? What compliment can we give Student A? What might Student A do to improve her work? What do you notice about your own work after looking at Student A's and Student B's work?"