8.G.9

Volume of Cylinders
- Used the Video Clip from Dan Meyer to introduce the segment from the movie "Holes". The kids at this "juvenile detention" center have to dig a cylindrical hole that is 5 feet in diameter and 5 feet deep, using their shovel as a measuring stick. One kid has a slightly shorter shovel...students have to determine how much of a difference that makes by calculating the volume of the dirt removed. After students were hooked we discussed how to calculate the volume of a cylinder by comparing it to calculating the volume of a rectangular prism. Volume equals Area of Base x Height

- Practice activity for Area and Circumference of Circles as well as Volume of Cylinders.

- Application problem (Again from Dan Meyer)...which one can hold more popcorn...a cylinder made from rolling a 8.5 by 11 paper long or short?

[|Brian Wyzlic] on [|May 28, 2012 at 1:47 am] said:   My students love when we have Play-Doh days! In addition to volume, we use the Fun Factory to model functions (as an input/output model). We didn’t do volume in 8th grade this year, but I have extended this to spheres as well — and they measure volume by smooshing a sphere (technical term) into a cylinder with the same radius. This ends up being 2/3 of the height of the sphere, and they can then discover the formula used for volume of a sphere as well. It’s more of a high school-level activity, but not beyond the grasp of middle schoolers