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Mystified by Exemplars?
A collection of open middled math problems that requires more in depth thought and understanding of the math concept. Easy to use, plenty of problems, and great for enrichment. (K-12)
Delta Math is a free website for teachers and students covering a wide range of math content from middle school through AP Calculus.
App that lets kids use an app on their phone to capture their handwritten work, then gives feedback on where they went wrong in the equation.
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