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  2. Prosthaphaeresis - Wikipedia

    en.wikipedia.org/wiki/Prosthaphaeresis

    Astronomers had to make thousands of such calculations, and because the best method of multiplication available was long multiplication, ... 72° 78.8 → : 10 2 × 0 ...

  3. Otto Steiger (engineer) - Wikipedia

    en.wikipedia.org/wiki/Otto_Steiger_(engineer)

    Otto Steiger (1858–1923) was a Swiss engineer. Steiger came from St. Gallen and lived in Munich.. Steiger is known for the invention and construction of the Millionaire mechanical calculator, the first commercially successful direct multiplication calculator (German patent 1892).

  4. Windows Calculator - Wikipedia

    en.wikipedia.org/wiki/Windows_Calculator

    A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.

  5. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    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.

  6. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    Arithmetic is the fundamental branch of mathematics that studies numbers and their operations. In particular, it deals with numerical calculations using the arithmetic operations of addition, subtraction, multiplication, and division. [1]

  7. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    Friden made a calculator that also provided square roots, basically by doing division, but with added mechanism that automatically incremented the number in the keyboard in a systematic fashion. The last of the mechanical calculators were likely to have short-cut multiplication, and some ten-key, serial-entry types had decimal-point keys.

  8. Sharp QT-8D - Wikipedia

    en.wikipedia.org/wiki/Sharp_QT-8D

    The QT-8D was released in Japan at a price of 99,800 Japanese yen, a new low for electronic calculators. [4] The retail price in the United States was $395 in 1970, [1] [5] equivalent to about $2,790 in 2021. [6] The QT-8D only performs the four basic arithmetic operations of addition, subtraction, multiplication, and division. [1]

  9. Scientific calculator - Wikipedia

    en.wikipedia.org/wiki/Scientific_calculator

    Casio fx-77, a solar-powered digital calculator from the 1980s using a single-line LCD. A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic (addition, subtraction, multiplication, division) and advanced (trigonometric, hyperbolic, etc.) mathematical operations and functions.