This lesson brings together the skills and concepts that have been studied in the unit so far. Students solve problems that can be represented by equations of the form and . A bit of scaffolding is offered in the first activity to reactivate students’ understanding of tape diagrams, but after that, no scaffolding is offered so that students can make sense of problems and choose representations on their own (MP1). The last activity is optional because no new concepts are covered. It does, however, offer additional practice writing and solving equations of the form and to solve real-world problems.