Other
West Contra Costa Usd: Volume: A Foundation in Unit Cubes [Pdf]
A very detailed lesson on determining the volume of rectangular prisms, teaching students how to derive the formula for volume, and to use it successfully. Plenty of examples, student work, and assessment options.
Texas Education Agency
Texas Gateway: Modeling the Volume of a Rectangular Prism
This activity provides an opportunity for students to model the volume of a rectangular prism and make connections to the formula, V=l ' w ' h.