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The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]
The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.
The HP-32S (codenamed "Leonardo") was a programmable RPN scientific calculator introduced by Hewlett-Packard in 1988. [1] It was succeeded by the HP-32SII scientific calculator. [ 2 ]
Neelakanta Bhanu Prakash (born 13 October 1999) is a human calculator, YouTuber and entrepreneur from Hyderabad, India, and is titled as the "World's Fastest Human Calculator". [1] He won gold in the 2020 Mental Calculation World Championship at Mind Sports Olympiad 2020. He also holds 50 Limca records for his mathematical calculations. [2] [3] [4]
The first American-made pocket-sized calculator, the Bowmar 901B (popularly termed The Bowmar Brain), measuring 5.2 by 3.0 by 1.5 inches (132 mm × 76 mm × 38 mm), came out in the Autumn of 1971, with four functions and an eight-digit red LED display, for US$240, while in August 1972 the four-function Sinclair Executive became the first ...
The TI-82 is a graphing calculator made by Texas Instruments. The TI-82 was designed in 1993 as an upgraded version of and replacement for the TI-81. [1] [2] It was the direct predecessor of the TI-83. It shares with the TI-85 a 6 MHz Zilog Z80 microprocessor. Like the TI-81, the TI-82 features a 96×64 pixel display, and the core feature set ...
The user has three chances to enter the correct number. If the answer is incorrect, the display shows "EEE". After the third wrong answer, the correct answer is shown. If the answer supplied is correct, the Little Professor goes to the next equation. [2] The Little Professor shows the number of correct first answers after each set of 10 ...
The TI-84 Plus C Silver Edition was released in 2013 as the first Z80-based Texas Instruments graphing calculator with a color screen.It had a 320×240-pixel full-color screen, a modified version of the TI-84 Plus's 2.55MP operating system, a removable 1200 mAh rechargeable lithium-ion battery, and keystroke compatibility with existing math and programming tools. [6]