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  2. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    This method requires the memorization of squares from 1 to a where a is the absolute difference between n and 100. For example, students who have memorized their squares from 1 to 24 can apply this method to any integer from 76 to 124. The square of n (i.e., 100 ± a) is 100(100 ± 2a) + a 2

  3. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For instance, 7 divided by 2 is not a whole number but 3.5. [73] One way to ensure that the result is an integer is to round the result to a whole number. However, this method leads to inaccuracies as the original value is altered. [74] Another method is to perform the division only partially and retain the remainder. For example, 7 divided by ...

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    This was solved by the inclusion of axioms with the apodictic inference rules of mathematical theories; the re-introduction of axiomatic method pioneered by the ancient Greeks. [6] It results that "rigor" is no more a relevant concept in mathematics, as a proof is either correct or erroneous, and a "rigorous proof" is simply a pleonasm .

  5. Psychological pricing - Wikipedia

    en.wikipedia.org/wiki/Psychological_pricing

    In this pricing method, retail prices are often expressed as just-below numbers: numbers that are just a little less than a round number, e.g. $19.99 or £2.98. [1] There is evidence that consumers tend to perceive just-below prices (also referred to as "odd prices") as being lower than they are, tending to round to the next lowest monetary unit.

  6. Solar irradiance - Wikipedia

    en.wikipedia.org/wiki/Solar_irradiance

    Solar radiation maps are built using databases derived from satellite imagery, as for example using visible images from Meteosat Prime satellite. A method is applied to the images to determine solar radiation. One well validated satellite-to-irradiance model is the SUNY model. [39] The accuracy of this model is well evaluated.

  7. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    It is a slab of white marble 149 cm (59 in) in length, 75 cm (30 in) wide, and 4.5 cm (2 in) thick, on which are 5 groups of markings. In the tablet's center is a set of 5 parallel lines equally divided by a vertical line, capped with a semicircle at the intersection of the bottom-most horizontal line and the single vertical line.

  8. macOS - Wikipedia

    en.wikipedia.org/wiki/MacOS

    简体中文 - Simplified Chinese; ... The current Apple-endorsed method is the open-source XQuartz project; ... On June 6, 2005, ...

  9. Google Play - Wikipedia

    en.wikipedia.org/wiki/Google_Play

    On March 6, 2017, five years after Google Play's launch, Google released lists of the best-selling apps, games, movies, music, and books over the past five years. [ 154 ] [ 155 ] In June 2017, Google introduced "Android Excellence", a new editorial program to highlight the apps deemed the highest quality by the Google Play editors.