This Problem Set is a part of the Lesson 4, Unit 8, Grade 2. In this lesson, students focus solely on the square and build its three-dimensional counterpart, the cube. They use toothpicks of equal length and an adhesive (e.g., sticky tack) to construct a cube. After constructing the cube, students count the number of corners, see that right angles are formed at each corner, and see that six square faces make up a cube.