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Free Math Resources - Tutorials, Formulas, Calculators, Directories is a great site I found that has a huge number of resources in math.
These resources can be used by teachers, students, or both.
There are math standards and benchmarks, tutorial videos, interactive activities and puzzles, how-to's, calculators and converters, how to use different measuring tools, metric system, formulas, and topics in each area of math.
This is a great resource for teachers and students. Please share!