Either way, the Casio Graphing calculator line that has been upgraded and introduced at CES 2011 is a sure winner. Mike Reiners notes that Casio was the innovator of the graphing calculator over 25 years ago. Mike is a full time teacher in Minnesota, and comes up with some novel ideas to challenge his students, using the capabilities of the graphing calculator. The secret to the long battery power of the unit gives you over 140 hours of capacity on 4 AAA batteries.
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