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Math

  • Wolfram MathWorld
  • Ask Dr. Math
  • Math.com
  • Khan Academy
    Provides interactive modules that span the secondary curriculum, using virtual manipulatives, instructional videos, and detailed explanations ...
  • Phet
    A collection of interactive math simulators, arranged by topic/application
  • IXL Math
    Open source for digital math problems; vertically aligned, and arranged topically