Webgraphing is a great website to use in a math classroom. It is hard to verbally explain how to use a graphing calculator. This website allows you to input functions to graph online. This is a great tool to use in class to demonstrate to students how to use graphing calculators. Plus it creates more accurate graphs instead of the teacher having to hand draw every graph. In addition, students that do not have access to a graphing calculator can get free basic use from any computer with internet access.
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