Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2tz/ Esercizi: http://www.khanacademy.org/exercise/adding_negative_numbers Traduzione in Italiano del Video: Adding integers with different signs http://www.youtube.com/watch?feature=player_embedded&v=NrVvu7cM8_o http://www.khanacademy.org/math/arithmetic/addition-subtraction/v/adding-integers-with-different-signs