**Volume** is the amount of space occupied by a three-dimensional object.

Volume is measured in cubic units.
An object's volume is the number of unit cubes which comprise the object.
A unit cube is a cube with the dimensions of 1 unit by 1 unit by 1 unit.
The volume of a unit cube is 1 cubic unit. | |

By counting, there are 8 1-inch unit cubes in each layer.

There are 3 layers of 8 cubes. Add to find the total number of cubes.

So, 24 1-inch unit cubes will fill the box.

Since each cube is 1 cubic inch, the volume of the box is 24 cubic inches.