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Simple to use, good for showing multiple connections to key ideas.

Ideas for using Wolfram Alpha with students. 

fascinating the k-2 looks like good discovery learning. You need to download a free software in order to 'play' with the mathematical objects/graphs/shapes etc.

Chartle.net tears down the complexity of online visualizations - offers simplicity, ubiquity and interactivity instead.

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This could be used for math warm-ups!

We look into how much paper currency and coin production is in circulation, and some interesting facts surrounding the U.S. Mint's production.

Build graphical charts using NFL, NBA, College Basketball, College Football, and NASCAR stats.