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National Library of Virtual Manipulatives
provides interactive online math lessons, activities, and assessments. Topics include fractions, functions, geometric transformations, integer arithmetic, patterns and sequences, probability, right triangle trigonometry, slope, triangle geometry, and writing equations of lines. Calculate what an excavation company should charge for digging a hole. Analyze three pollution reduction plans. Determine the best rate for repaying a loan. (Utah State University, National Science Foundation)
