Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2w9/ Esercizi: http://www.khanacademy.org/exercises?exid=multiplying_expressions_1 Traduzione in Italiano del video Level 1 multiplying expressions http://www.youtube.com/watch?v=Sc0e6xrRJYY http://www.khanacademy.org/video/level-1-multiplying-expressions?playlist=Algebra