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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Sum the digits of 500702: 5 + 0 + 0 + (7 + 0 + 2 = 9, which counts as 0) = 5; 5 = 5, so there is a good chance that the prediction that 6,338 × 79 equals 500,702 is right. The same procedure can be used with multiple operations, repeating steps 1 and 2 for each operation.

  3. File:...Mental and scholastic tests (IA ...

    en.wikipedia.org/wiki/File:...Mental_and...

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Help; Learn to edit; Community portal; Recent changes; Upload file

  4. Shakuntala Devi - Wikipedia

    en.wikipedia.org/wiki/Shakuntala_Devi

    Shakuntala Devi (4 November 1929 – 21 April 2013) was an Indian mental calculator, astrologer, and writer, popularly known as the "Human Computer".Her talent earned her a place in the 1982 edition of The Guinness Book of World Records.

  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

    Rapid mental computation system as a tool for algorithmic thinking of elementary school students development. European Researcher 25(7): 1105–1110, 2012 [1] . The Trachtenberg Speed System of Basic Mathematics by Jakow Trachtenberg, A. Cutler (Translator), R. McShane (Translator), was published by Doubleday and Company, Inc. Garden City, New ...

  7. List of mathematics competitions - Wikipedia

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

    Canadian Open Mathematics Challenge — Canada's premier national mathematics competition open to any student with an interest in and grasp of high school math and organised by Canadian Mathematical Society; Canadian Mathematical Olympiad — competition whose top performers represent Canada at the International Mathematical Olympiad

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  9. Scott Flansburg - Wikipedia

    en.wikipedia.org/wiki/Scott_Flansburg

    Scott Flansburg (born December 28, 1963) is an American dubbed "The Human Calculator" and listed in the Guinness Book of World Records for speed of mental calculation. He is the annual host and ambassador for The National Counting Bee, a math educator, and media personality. He has published the books Math Magic and Math Magic for Your Kids. [1]