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  2. 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 ...

  3. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    It has been shown that during high levels of physical activity there is a negative effect on mental task performance. [3] This means that too much physical work can decrease accuracy and output of mental math calculations. Physiological measures, specifically EEG, have been shown to be useful in indicating mental workload. [4]

  4. List of mathematics competitions - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematics...

    Math League (grades 4–12) Math-O-Vision (grades 9–12) Math Prize for Girls; MathWorks Math Modeling Challenge; Mu Alpha Theta; Pi Math Contest (for elementary, middle and high school students) United States of America Mathematical Olympiad (USAMO) United States of America Mathematical Talent Search (USAMTS) Rocket City Math League (pre ...

  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. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Subtract the rightmost digit from 10. Subtract the remaining digits from 9. Double the result. Add half of the neighbor to the right, plus 5 if the digit is odd. For the leading zero, subtract 2 from half of the neighbor. Example: 492 × 3 = 1476 Working from right to left: (10 − 2) × 2 + Half of 0 (0) = 16. Write 6, carry 1.

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