Mathematics - Geometry - Volume and Surface Area - Volume of cubes and rectangular prisms - How Many Cubes?

Show a rectangular box filled with visible unit cubes. 'How many cubes are inside?' Students count layers: 3 layers of 4×2 = 24 cubes. Do 4 scenarios with different box sizes. Some have hidden cubes (behind others) that must be inferred. The student discovers: counting cubes = finding volume.