I had a math teacher approach me this week with a Texas Instruments TI-83 Plus graphing calculator. He is an avid user of the Promethean board and hates to change to the document camera to show his students how to enter problems into their graphic calculator. "You'd think Texas Instruments would have a virtual calculator that teachers could use on their computer so they could show students how to enter their problems," he said to me. I decided to look around, and sure enough, there IS a virtual TI-83 calculator that you can download and use with your class. It looks just like the real calculator, and you click the buttons on it just like you would on the real thing. (Don't forget to click the power button on the image, or the calculator won't turn on!)
Where did I find this? At Video Math Teacher! Check it out, secondary math teachers.