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  2. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    The method for general multiplication is a method to achieve multiplications with low space complexity, i.e. as few temporary results as possible to be kept in memory. . This is achieved by noting that the final digit is completely determined by multiplying the last digit of the multiplic

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  4. Professor's Cube - Wikipedia

    en.wikipedia.org/wiki/Professor's_Cube

    Professor's Cube in original packaging The V-Cube 5 in its original packaging. The Professor's Cube was invented by Udo Krell in 1981. Out of the many designs that were proposed, Udo Krell's design was the first 5×5×5 design that was manufactured and sold.

  5. 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]

  6. GeoGebra - Wikipedia

    en.wikipedia.org/wiki/GeoGebra

    GeoGebra can store variables for numbers, vectors and points, calculate derivatives and integrals of functions, and has a full complement of commands like Root or Extremum. Teachers and students can use GeoGebra as an aid in formulating and proving geometric conjectures. GeoGebra's main features are: Interactive geometry environment (2D and 3D)

  7. Pentation - Wikipedia

    en.wikipedia.org/wiki/Pentation

    Pentation is the next hyperoperation (infinite sequence of arithmetic operations, based off the previous one each time) after tetration and before hexation. It is defined as iterated (repeated) tetration (assuming right-associativity). This is similar to as tetration is iterated right-associative exponentiation. [1]