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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    The first Mental Calculations World Championship took place in 1998. This event repeats every year and now occurs online. It consists of a range of different tasks such as addition, subtraction, multiplication, division, irrational and exact square roots, cube roots and deeper roots, factorizations, fractions, and calendar dates. [8]

  3. 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 ...

  4. Mental abacus - Wikipedia

    en.wikipedia.org/wiki/Mental_abacus

    Mental calculation is said to improve mental capability, increases speed of response, memory power, and concentration power. Many veteran and prolific abacus users in China, Japan, South Korea, and others who use the abacus daily, naturally tend to not use the abacus any more, but perform calculations by visualizing the abacus.

  5. Mental Calculation World Cup - Wikipedia

    en.wikipedia.org/wiki/Mental_Calculation_World_Cup

    The Mental Calculation World Cup 2016 was held from 23 to 25 September 2016, in Bielefeld Germany. 31 mental calculators from 16 countries participated. The World Cup involved the following 5 main contests: Adding ten 10-digit numbers, 7 minutes Winner: Yuki Kimura (Japan) Multiplying two 8-digit numbers, 10 minutes Winner: Lee Jeonghee (South ...

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  7. Jakow Trachtenberg - Wikipedia

    en.wikipedia.org/wiki/Jakow_Trachtenberg

    Jakow Trachtenberg (17 June 1888 – 26 October 1951) was a mathematician who developed the mental calculation techniques called the Trachtenberg system. [1]He was born in Odessa, in the Russian Empire (today Ukraine).

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