Mathematics - Geometry - Volume and Surface Area - Volume of cubes and rectangular prisms - Box Builder

Three sliders: length, width, height (1-10). A 3D box fills with visible unit cubes. The student sees: bottom layer has L×W cubes, and there are H layers. Total = L×W×H. Display: 'Volume = length × width × height'. Also show: changing just height makes the box taller (more layers). Changing width ma