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  2. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    Ten key input mode is available in printing calculators from companies such as Sharp, [20] and in software calculators like Judy's TenKey [21] used by accounting firms. Online tenkey training and certification tools are available as well, [22] [23] and some businesses use ten key typing speed as an employment criterion.

  3. Numeric keypad - Wikipedia

    en.wikipedia.org/wiki/Numeric_keypad

    For use with a shorter keyboard or laptop which omits the numberpad Bluetooth numeric keypad, working also as calculator. A numeric keypad, number pad, numpad, or ten key, [1] [2] [3] is the palm-sized, usually-17-key section of a standard computer keyboard, usually on the far right. It provides calculator-style efficiency for entering numbers.

  4. Mechanical calculator - Wikipedia

    en.wikipedia.org/wiki/Mechanical_calculator

    Comptometer type calculators were often retained for much longer to be used for adding and listing duties, especially in accounting, since a trained and skilled operator could enter all the digits of a number in one movement of the hands on a comptometer quicker than was possible serially with a 10-key electronic calculator. In fact, it was ...

  5. These Calculators Make Quick Work of Standard Math ... - AOL

    www.aol.com/best-calculators-students...

    These Calculators Make Quick Work of Standard Math, Accounting Problems, and Complex Equations Stephen Slaybaugh, Danny Perez, Alex Rennie May 21, 2024 at 2:44 PM

  6. Adding machine - Wikipedia

    en.wikipedia.org/wiki/Adding_machine

    To add, for example, the amounts of 30.72 and 4.49 (which, in adding machine terms, on a decimal adding machine is 3,072 plus 449 "decimal units"), the following process took place: Press the 3 key in the column fourth from the right (multiples of one thousand), the 7 key in the column second from right (multiples of ten) and the 2 key in the ...

  7. Comptometer - Wikipedia

    en.wikipedia.org/wiki/Comptometer

    The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.. A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making ...