Un número irracional muy famoso:

 PHI EL NÚMERO MÁS BELLO

Set notation and intervals in the Real Number Line:

pages 16 and 17 in your textbook

also, videos:  

Interval Notation and the Number Line

https://youtu.be/JQuPaIYsivY

For 4ºA:

Exercises of the fist theme in the textbook

https://drive.google.com/open?id=0BzbMH1hz77vrcS05VHlRbUVYdWc

https://drive.google.com/open?id=0BzbMH1hz77vrX0NVQjJCcUtsVjA

https://drive.google.com/open?id=0BzbMH1hz77vrTm1EeWVFRWFSSUk

For 4ºB:

Pages 16 and 17 in the text6book

https://drive.google.com/open?id=0BzbMH1hz77vrcS05VHlRbUVYdWc