Moltiplicazione e Divisione di Numeri Negativi

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2x0/ Esercizi: http://www.khanacademy.org/exercises?exid=multiplying_and_dividing_negative_numbers Traduzione in Italiano del video http://www.youtube.com/watch?v=d8lP5tR2R3Q http://www.khanacademy.org/video/multiplying-and-dividing-negative-numbers?playlist=Pre-algebra Help us caption & translate this video! http://amara.org/v/B2x0/