Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2uJ/ Esercizi: http://www.khanacademy.org/exercise/adding_fractions_with_common_denominators Traduzione in Italiano del video Adding Fractions with Like Denominators http://www.youtube.com/watch?feature=player_embedded&v=EJjnEau6aeI http://www.khanacademy.org/math/arithmetic/fractions/v/adding-fractions-with-like-denominators Help us caption & translate this video! http://amara.org/v/B2uJ/