Which calculator company first successfully marketed their product to schools by creating comprehensive teacher training programs and curriculum materials in the 1980s?

The educational mathematics product market has evolved significantly over the decades, from basic calculators to sophisticated digital learning platforms. Test your knowledge about how companies have positioned and marketed these essential learning tools, and how their strategies have shaped mathematics education worldwide. This trivia question focuses on a pivotal moment in the retail history of educational mathematics tools.

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Texas Instruments with their TI graphing calculators
Casio with their scientific calculator line
HP with their RPN calculators
Sharp with their EL series calculators