University of Cambridge
University of Cambridge: Nrich: More Christmas Boxes
Sharpen your logic and spatial reasoning skills while working on this challenge. Solution available.
Ducksters
Ducksters: Kids Math: Finding the Volume of a Cube or Box
Learn how to solve the volume of a cube or box on this site. See how the formula is used to find the volume of the shape.
AAA Math
Aaa Math: Volume of a Rectangular Prism
Find out how to find the volume of a prism, and follow up with some practice problems.