Proprieta' dell'Identita' dell'1

Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2um/ Esercizi: http://www.khanacademy.org/exercise/properties_of_numbers_2 Traduzione in Italiano del video Identity Property of 1 http://www.youtube.com/watch?feature=player_embedded&v=6nZp2QGeQ9k http://www.khanacademy.org/math/arithmetic/number-properties/v/identity-property-of-1