Watch the following video paying attention to the way in which the teacher uses layers to calculate the number of cubes used in the prism.[br][br]Record in your book how many cubes are in each layer and how many layers there are. Can you write a mathematical sentence using this information to show how to calculate the number of cubes in the prism?

Now we are going to extend this a bit further. Have a play with this application to change the volume of the rectangular prism by changing the height. [br][br][br]Using what you know about layers, can you write an explanation of what is happening in your book?