Listening to Numbers (muy útil)

http://www.bbc.co.uk/skillswise/maths

http://www.esl-lab.com/num.htm

http://esl.about.com/library/listening/bllis_beg_number_quiz.htm

http://fog.ccsf.cc.ca.us/~lfried/activity/listening/ex1phoneex.html

http://www.esl-lab.com/phone.htm