Which of these calculator models, launched in 1972, is widely credited with making advanced scientific calculations accessible to students and revolutionizing mathematics education?

The tools mathematicians use for calculation and problem-solving have evolved dramatically over centuries. From ancient counting boards to modern software, these innovations have transformed how mathematics is taught, learned, and applied. This poll tests your knowledge about a significant product innovation that revolutionized mathematics education and accessibility in the 20th century.

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Hewlett-Packard HP-35, the first scientific pocket calculator
Texas Instruments SR-10, marketed as the 'electronic slide rule'
Casio fx-1, Japan's first scientific calculator
Sinclair Scientific, the first affordable scientific calculator under $100