Students will learn how to find the volume of a right rectangular prism by counting unit cubes. Each cube may be associated with a measure. For example, cubic in, cubic ft, etc. Any unit of length known at this time is fair game. Here's a lesson. Students can practice here, and here.
Next, give your students these challenges:
Conclude by leading this investigation:
5.MD.C.3: Recognize volume as an attribute of solid figures and understand concepts of volume measurement.
5.MD.C.4: Measure volumes by counting unit cubes, using cubic cm, cubic in, cubic ft, and improvised units.