I believe that method is occassionally presented in math classes for elementary ed majors. My colleagues were familiar with it when I "discovered" it and showed it to them.
Pretty cool, though. I occassionally show it to the students in my classes.
Hard as it is to fathom, Mr President, just because you’re the leader of the free world doesn’t entitle you to a free pass. Unfortunately, just a free press. -- Neil Cavuto