INTEGER NUMBERS (2 ESO)

http://www.pbslearningmedia.org/resource/01151663-7e22-4421-87bb-ef1f7778f7cd/what-is-an-integer-pbs-math-club/

http://www.pbslearningmedia.org/resource/1ea135bf-772f-4ed1-88bd-52fc5bc84adc/what-is-an-integer-pbs-math-club/