Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2uO/ Esercizi: http://www.khanacademy.org/exercise/adding_subtracting_mixed_numbers_1 Traduzione in Italiano del video Subtracting Mixed Numbers 2 http://www.youtube.com/watch?feature=player_embedded&v=4LYtLMmDuzw http://www.khanacademy.org/math/arithmetic/fractions/v/subtracting-mixed-numbers-2