Desmos is an online graphing calculator who claim "We are on a mission to help every student learn math and love learning math". It is a very well received tool by math teachers everywhere.
Basic Introduction to Desmos
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Introduction to Desmos Activities
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Desmos DIY: Building Your Own Activities
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Desmos also has a very good channel on YouTube with many more video tutorials submitted by the company, as well as teachers who use this great math tool.
Click here for the Desmos YouTube Channel
Click here for the Desmos YouTube Channel