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This blog shares a variety of resources that can be used to do academic research. Tools include resources to researc, curate data, save and organize data, read and review data, synthesize and take notes, and cite data

There is a free trial version of the materials in the National Library of virtual manipulatives. Math topics Numbers and Operations, Algebra, Geometry, Measurement and Data Analysis & Probablity are covered. I did not come across anything asking for money so I a not certain there is a cost. There are tons of manipulatives to access from each of the above categories. This site is associated with the Uta State University.

This site provides itneractive whiteboard resources for various subjects.