Help us caption and translate this video on Amara.org: http://www.amara.org/en/v/B2ww/ Esercizi: http://www.khanacademy.org/exercises?exid=expressing_ratios_as_fractions Traduzione in Italiano del video Introduction to Ratios (new HD version) http://www.youtube.com/watch?v=HpdMJaKaXXc http://www.khanacademy.org/video/introduction-to-ratios--new-hd-version?playlist=Pre-algebra Help us caption & translate this video! http://amara.org/v/B2ww/