http://www.mathmaniacs.org/lessons/01-binary/socratic.html http://www.mathmaniacs.org/lessons/01-binary/socratic.html That exercise is excellent to teach kids

http://www.mathmaniacs.org/lessons/01-binary/socratic.html http://www.mathmaniacs.org/lessons/01-binary/socratic.html That exercise is excellent to teach kids how to count in binary and why computers are based on it.