Question

A rectangular prism has a length of 7 cm, a width of 4 cm, and a height of 2 1/2 cm.

The prism is filled with cubes that have edge lengths of 1/2 cm.



How many cubes are needed to fill the rectangular prism?

Answer 1

560.
To fill the rectangular prism across you'll need 14. To fill it's width, you'll need 8 of those 14 sections, resulting in 112, and to fill it's height, you'll need 5 of those.