Interactive Sites for Math

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Real World Math is a collection of free math activities for Google Earth designed for students and educators. Mathematics is much more than a set  of problems in a textbook.  In the virtual world of Google Earth, concepts and challenges can be presented in a meaningful way that portray the usefulness of the ideas.
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Living Math Book List is a fantastic site that introduces books (mostly fiction) for almost all math concepts. This is a great way to teach ELA standards in a math lesson or vice versa!
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Dan Meyer's blog provides many real world problem solving challenges that involve Geometry and Algebra. His technique is a great model for real world math application.
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Math is about more than just numbers and equations.  Mathalicious lessons teach standards-based math through real-world topics that students care about.