I think document cameras are one of the best technology tools for the math classroom available today. If you have not had the opportunity to use one, it is like an overhead, only 100x better since you do not need transparencies.
Having students share their work can be so important, since student mistakes can sometimes teach more than a correct response. With a document camera, students do not have to redo their work on the board to show the class, they simply lay their paper under the camera and it is projected up on the screen. 3-dimensional objects can also easily be shown, so that a geometry demonstration can be shown to the whole class, such as disecting a 3-D figure by a plane.
The document camera I have used is called a Lumens, and runs for a little over $500 but a high quality document camera can cost 10x more.
At this point I am only a student teacher, but I highly recommend this technology! I am sure that I am only beginning to realize the many benefits of this tool.
See a sample of how a document camera works in the video below.
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