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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Mental calculation often involves the use of specific techniques devised for specific types of problems. People with unusually high ability to perform mental calculations are called mental calculators or lightning calculators. Many of these techniques take advantage of or rely on the decimal numeral system.

  3. Mathnasium - Wikipedia

    en.wikipedia.org/wiki/Mathnasium

    A Mathnasium location in Franconia, Virginia. Mathnasium (also Mathnasium Learning Center) is an American education brand and supplemental math learning franchise consisting of over 1,000 learning centers in North America, South America, Europe, Afghanistan, and Asia that provides instruction to students in pre-kindergarten through high school. [1]

  4. Zerah Colburn (mental calculator) - Wikipedia

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

    Zerah was reported to have been able to solve fairly complex problems. For example, the sixth Fermat number is 2 2 5 +1 (or 2 32 +1). The question is whether this number, 4,294,967,297, is prime or not. Zerah calculated in his head that it was not and had a divisor of 641. (Its other proper divisor is 6,700,417).

  5. 10 Hard Math Problems That Even the Smartest People in the ...

    www.aol.com/lifestyle/10-hard-math-problems-even...

    Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

  6. Mathematical Kangaroo - Wikipedia

    en.wikipedia.org/wiki/Mathematical_Kangaroo

    In Canada, math contest clubs for elementary school children teach "questions typical of the Math Kangaroo contest", starting with those with a visual component and helping to develop logic and spatial reasoning. [9] Students in Pakistan took part for the first time in 2005, the numbers increasing each year since. [10]

  7. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job). The bottom number in each worksheet is used to fill out two if the lines in the main W4 form. The main form is filed with the employer, and the worksheets are discarded or held by the employee.

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