Building a House

Here is a "house" that I built using cubes.

Questions:

What is the largest number of cubes that I could have used to make my house?

 

What is the smallest number of cubes that I could have used to make my house?

Use this Java applet from the Freudenthal Institute to help you think about the possible arrangements:

Building houses with side views
http://www.fi.uu.nl/toepassingen/02015/toepassing_wisweb.en.html