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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For example: 24 x 11 = 264 because 2 + 4 = 6 and the 6 is placed in between the 2 and the 4. Second example: 87 x 11 = 957 because 8 + 7 = 15 so the 5 goes in between the 8 and the 7 and the 1 is carried to the 8. So it is basically 857 + 100 = 957.

  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. Zerah Colburn (mental calculator) - Wikipedia

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

    In September 1813 Colburn was being exhibited in Dublin. Colburn was pitted against the eight-year-old William Rowan Hamilton in a mental arithmetic contest, with Colburn emerging the clear victor. In reaction to his defeat, Hamilton dedicated less time to studying languages and more time to studying mathematics.

  5. 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.

  6. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Some students studying math may develop an apprehension or fear about their performance in the subject. This is known as math anxiety or math phobia, and is considered the most prominent of the disorders impacting academic performance. Math anxiety can develop due to various factors such as parental and teacher attitudes, social stereotypes ...

  7. 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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