Números enteros

https://www.youtube.com/watch?v=2AFZpUbGulk&t=136s
https://www.youtube.com/watch?v=MsVfXEtD9Cw

https://www.youtube.com/watch?v=tNxHToZ-LbE

https://www.youtube.com/watch?v=qDsDM0oq-hw

https://www.youtube.com/watch?v=SRPkdB0vJzU&t=259s

https://www.youtube.com/watch?v=RxX-JhmxLG4

https://www.youtube.com/watch?v=9xCbQMdQ2S4

https://www.youtube.com/watch?v=lTpbx63UK6M&list=PLeySRPnY35dF1DoKO_5VyboxzdT4UyyPA&index=2

https://www.youtube.com/watch?v=g25yIlEEwrs