It is important that the web sources chosen are robust and reliable. The CSIRO Maths and stats by email is a free fortnightly email newsletter featuring mathematics news and activities.
It includes hands-on mathematics activities, curious and interesting mathematics websites, puzzles, news about the latest mathematics events and occasional competitions.
The activities are explained using everyday language and use easy-to-find, everyday materials. How about exploring the statistics of thumb wrestling with your class?
Maths and stats by email is a valuable educational resource. Most articles and activities have web links for further investigation. There is an activity archive and subscription is free.