These are unit cubes which may be mm³, cm³ and m³. There are multiple ways of finding the volume of a cube. For example, counting the cubes of the top layer and by cubing one of the cube’s sides.

Perhaps even more surprising, abstract ideas from high school math can help, like the formula for the sum of cubes. But that’s the way math works, and that’s why we keep exploring. So keep an eye on ...