I like your signature, Astronuc. You would be surprised how many people drop out of math because they lose sight of the "why" to math, it's difficult not to. Did anybody record this Dr. Phil episode? http://www.drphil.com/shows/show/767" In it, a young woman's mother mentioned that she was doing very well in math and her teacher did not understand what was wrong. The young lady said that she was just memorizing theorems but had no idea WHAT she was doing! Dr. Phil's reply was something along the lines of 'maybe you just aren't cut out for math, your gift may be in something else'. :grumpy: Great advice, Dr. Phil. My question is this: do teachers really know what's happening with numbers beyond arithmetic or have they just 'memorized theorems' to get through college and get a teaching degree?