Visualizing Extraordinary Ways To Multiply

Consider the oddity of the long-multiplication algorithm most of us learned in school. Discover a completely new way to ... (more)

Consider the oddity of the long-multiplication algorithm most of us learned in school. Discover a completely new way to multiply that is graphical--and just as strange! Then analyze how these two systems work. Finally, solve the mystery of why negative times negative is always positive. (less)