Interactive Unit Cubes Tool
This unit cube activity helps students understand 3-dimensional space, visualize solids in it, and to understand the basic idea of volume. It's most useful for grades 3-5. You're given a shape made with unit cubes on the left and you need to build the same shape in the workarea on the right. You can also see a top view of the shape, which lists how many cubes are in each column. The shape can be rotated to see it from all sides.