Understand Unit Cube Concept Practice Test

Kevin builds two different rectangular prisms using unit cubes. Prism A is 4 units long, 2 units wide, and 3 units high. Prism B is 6 units long, 2 units wide, and 2 units high. How do their volumes compare?

Marcus builds a rectangular prism using unit cubes. The base layer has 12 unit cubes arranged in a 3 by 4 rectangle. He adds two more identical layers on top. What is the total volume of Marcus's rectangular prism?