Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2uq/ Esercizi: http://www.khanacademy.org/exercise/prime_factorization Traduzione in Italiano del video Prime Factorization http://www.youtube.com/watch?feature=player_embedded&v=ZKKDTfHcsG0 http://www.khanacademy.org/math/arithmetic/factors-multiples/v/prime-factorization