National Library of Virtual Manipulatives (great site, whiteboard friendly)
Why I didn’t hear of this site before I have no idea. The National Library of Virtual Manipulatives is a great site for mainly math but many of the manipulatives are just good thinking/problem solving for all classes.
They have activities for Pre-K to 12. Subjects include number and operations, algebra, geometry, measurement, and data analysis/probability.
How did I finally hear about this site? It was submitted here, on the bottom of our TIC Recommends page.
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[...] National Library of Virtual Manipulatives: Free virtual manipulatives for grades K-12. Great site. [...]