Which calculator brand was the first to successfully market graphing calculators to high schools in the 1990s, creating a new product category that revolutionized math education?

The mathematics education industry has seen remarkable technological innovations over the decades. From basic calculators to sophisticated software platforms, these tools have transformed how students learn and apply mathematical concepts. This trivia question focuses on a pivotal moment in retail innovation for mathematics education products that changed classroom dynamics forever.

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Texas Instruments (TI) with the TI-81 series
Casio with the fx-7000G series
Hewlett-Packard (HP) with the HP-28 series
Sharp with the EL-5200 series