Which calculator brand positioned itself as the education standard with the tagline "It's All About Prime" while introducing color-coded function keys that became an industry standard in mathematics classrooms?

Test your knowledge about one of the most successful product innovations in the field of mathematics education! While calculators have been around for decades, certain brands revolutionized the market with strategic positioning and innovative features that made them essential tools in classrooms worldwide. This poll explores how clever brand positioning transformed mathematical tools from luxury items to classroom necessities.

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Texas Instruments with the TI-84 series
Casio with the fx-CG50 series
HP with the Prime G series
Sharp with the EL-W516 series