Skip to main content


5th Grade Math - Calculating Volume of Rectangular Prisms

Clip 1/13: Calculating Volume of Rectangular Prisms PreLesson


Prior to her lesson on volume with her 5th-grade students, Mallory Williamson describes the purpose of the lesson and the ways she anticipates that students will respond to the three “acts,” phases in which additional information is introduced. She comments, “It’ll be interesting to see if they can take the information they are given and reason through to find a total volume.”

Teacher Commentary

I think, based on prior knowledge, students look at a formula and can solve and plug in certain amounts with that formula. So the reasoning behind using a Three-Act Task for finding volume is to actually use a form of estimating with volume, reasoning through with spatial recognition and not just a particular formula.

Materials & Artifacts