Length, Width, and Height

Find volume from three measurements by reasoning about layers, with no formula to memorize.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 6

Boxes have three measures. The length and width lie along the base. The height goes straight up.
Length times width gives one layer. This base is 4 by 2, so a layer has 8 cubes.
Height gives the number of layers. Three layers of 8 is 24 cubic units.
Turn the box on its side and the volume stays the same. Which side you call the base doesn't matter, so you can multiply in the order that's easiest.

Georgia's K-12 Mathematics Standards:

5.GSR.8.4 — Discover and explain how the volume of a right rectangular prism can be found by multiplying the area of the base times the height to solve authentic, mathematical problems.