Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2yI/ Esercizi: http://www.khanacademy.org/exercises?exid=addition_2 Traduzione in Italiano di Addition 2 http://www.youtube.com/watch?v=t2L3JFOqTEk&feature=player_embedded http://www.khanacademy.org/video/addition-2?playlist=Arithmetic Help us caption & translate this video! http://amara.org/v/B2yI/