Below are some websites that you may useful to look at:
The first website http://www.worksheetworks.com/ is a great site to find worksheets for your child. The site has worksheets for all different content areas.
The second website http://www.math-worksheet.org/ provides helpful instruction on math. Just scroll down a little to get past the ads and there is a lot of information there and help on solving math problems.
And the final two web sites are links to encyclopedias: http://www.encyclopedia.com/ and http://en.wikipedia.org/wiki/Main_Page . These may come in handy during research.
Now these are not the only sites out there that can provide information to you but these will give you a start. Plus if you are aware of any other websites you would like to share with the students and other parents please email me and I will get them posted.