Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2uL/ Esercizi: http://www.khanacademy.org/exercise/adding_subtracting_mixed_numbers_0.5 Traduzione in Italiano del video Adding Mixed Numbers http://www.youtube.com/watch?feature=player_embedded&v=4TBVB4hLQhY http://www.khanacademy.org/math/arithmetic/fractions/v/adding-mixed-numbers Help us caption & translate this video! http://amara.org/v/B2uL/