This Instructional Activity is a part of the Lesson 14, Unit 7, Grade 7. In this activity, students make sense of three different methods for calculating the surface area of a figure. Three different methods are described to students and they are asked to determine which one they agree with (if any). They then think about generalizing the methods to figure out if they would work for any prism. This activity connects to work they did with nets in a previous grade and builds upon strategies students might have to calculate surface area. As students work on the task, monitor for students who understand the different methods and can explain if any of them will work for any other prisms.