A right rectangular prism has the dimensions 4 units, 1 1 2 units, and 2 3 4 units. It is going to be packed with cubes with dimensions of 1 8 units on all sides. The number of cubes required to fill the prism is . The volume of the prism is unit cubes plus smaller cubes with a volume of cubic units. Using the volume formula, the volume of the prism is unit cubes and of a unit cube.