Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2xz/ Esercizi: http://www.khanacademy.org/exercises?exid=multiplication_3 Traduzione in Italiano del video Why Lattice Multiplication Works http://www.youtube.com/watch?v=S3z4XqC_YSc http://www.khanacademy.org/video/why-lattice-multiplication-works?playlist=Arithmetic Help us caption & translate this video! http://amara.org/v/B2xz/