This Problem Set is a part of the Lesson 10, Unit 5, Grade 8. Students know the volume formulas for cones and cylinders. Students apply the formulas for volume to real-world and mathematical problems. For the demonstrations in this lesson, the following items are needed: a stack of same-sized note cards, a stack of same-sized round disks, a cylinder and cone of the same dimensions, and something with which to fill the cone (e.g., rice, sand, or water).