An Ohio high school has increased class participation and comprehension in its math classes by adding wireless technology to the graphing calculators already owned by many students.

Knowing that so many students already use Texas Instruments' TI-83 Plus graphing calculator, the company developed a wireless system that allows teachers and students to beam questions and answers to each other.

The system, called the TI-Navigator, uses radio signals to send and receive information between a teacher terminal and individual calculators. During a lesson, a teacher can ask the students a question


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