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2. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   Mental calculation consists of arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator. People may use mental calculation when computing tools are not available, when it is faster than other means of calculation (such as conventional educational institution ...

3. Thomas Fuller (mental calculator) - Wikipedia

   en.wikipedia.org/wiki/Thomas_Fuller_(mental...

   Thomas Fuller (1710 – December 1790), also known as "Negro Demus" and the "Virginia Calculator", was an enslaved African renowned for his mathematical abilities. [ 1 ] History

4. Mental calculator - Wikipedia

   en.wikipedia.org/wiki/Mental_calculator

   A mental calculator or human calculator is a person with a prodigious ability in some area of mental calculation (such as adding, subtracting, multiplying or dividing large numbers). In 2005, a group of researchers led by Michael W. O'Boyle, an American psychologist previously working in Australia and now at Texas Tech University , has used MRI ...

5. Alberto Coto García - Wikipedia

   en.wikipedia.org/wiki/Alberto_Coto_García

   Alberto Coto García (born May 20, 1970) is a Spanish mental calculator. He was the world champion in mental calculation from 2008 to 2010. Professionally he is a financial adviser and accountant. He has demonstrated his skills and has appeared on some TV shows and news [citation needed]. In recent years he has carried out demonstrations and ...

6. Spreadsheet - Wikipedia

   en.wikipedia.org/wiki/Spreadsheet

   LANPAR innovated forward referencing/natural order calculation which didn't re-appear until Lotus 123 and Microsoft's MultiPlan Version 2. In modern spreadsheet applications, several spreadsheets, often known as worksheets or simply sheets, are gathered together to form a workbook. A workbook is physically represented by a file containing all ...

7. Acalculia - Wikipedia

   en.wikipedia.org/wiki/Acalculia

   Acalculia is associated with lesions of the parietal lobe (especially the angular gyrus) and the frontal lobe and can be an early sign of dementia.Acalculia is sometimes observed as a "pure" deficit, but is commonly observed as one of a constellation of symptoms, including agraphia, finger agnosia and right-left confusion, after damage to the left angular gyrus, known as Gerstmann syndrome.

8. Pascal's calculator - Wikipedia

   en.wikipedia.org/wiki/Pascal's_calculator

   Pascal's calculator (also known as the arithmetic machine or Pascaline) is a mechanical calculator invented by Blaise Pascal in 1642. Pascal was led to develop a calculator by the laborious arithmetical calculations required by his father's work as the supervisor of taxes in Rouen . [ 2 ]

9. Calculator input methods - Wikipedia

   en.wikipedia.org/wiki/Calculator_input_methods

   On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [1] [2] [3] On an expression or formula calculator, one types in an expression and then presses a key, such as "=" or "Enter", to evaluate the expression.