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  2. 39 (number) - Wikipedia

    en.wikipedia.org/wiki/39_(number)

    39 is the smallest natural number which has three partitions into three parts which all give the same product when multiplied: {25, 8, 6}, {24, 10, 5}, {20, 15, 4}. 39 is a Perrin number, coming after 17, 22, 29 (it is the sum of the first two mentioned). [5] Since the greatest prime factor of 39 2 + 1 = 1522 is 761, which is more than 39 twice ...

  3. GCSE - Wikipedia

    en.wikipedia.org/wiki/GCSE

    They usually start in Year 9 or Year 10 for the majority of pupils, with around two mock exams – serving as a simulation for the actual tests – normally being sat during the first half of Year 11, and the final GCSE examinations nearer to the end of spring, in England and Wales.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    According to Mikhail B. Sevryuk, in the January 2006 issue of the Bulletin of the American Mathematical Society, "The number of papers and books included in the Mathematical Reviews (MR) database since 1940 (the first year of operation of MR) is now more than 1.9 million, and more than 75 thousand items are added to the database each year. The ...

  5. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    log(10) = 1 + log(1) = 1; The first step in approximating the common logarithm is to put the number given in scientific notation. For example, the number 45 in scientific notation is 4.5 × 10 1, but one will call it a × 10 b. Next, find the logarithm of a, which is between 1 and 10. Start by finding the logarithm of 4, which is .60, and then ...

  6. Coin problem - Wikipedia

    en.wikipedia.org/wiki/Coin_problem

    Frobenius coin problem with 2-pence and 5-pence coins visualised as graphs: Sloping lines denote graphs of 2x+5y=n where n is the total in pence, and x and y are the non-negative number of 2p and 5p coins, respectively.

  7. Murderous Maths - Wikipedia

    en.wikipedia.org/wiki/Murderous_Maths

    Murderous Maths is a series of British educational books by author Kjartan Poskitt.Most of the books in the series are illustrated by illustrator Philip Reeve, with the exception of "The Secret Life of Codes", which is illustrated by Ian Baker, "Awesome Arithmetricks" illustrated by Daniel Postgate and Rob Davis, and "The Murderous Maths of Everything", also illustrated by Rob Davis.

  8. Cube (algebra) - Wikipedia

    en.wikipedia.org/wiki/Cube_(algebra)

    y = x 3 for values of 1 ≤ x ≤ 25.. In arithmetic and algebra, the cube of a number n is its third power, that is, the result of multiplying three instances of n together. The cube of a number n is denoted n 3, using a superscript 3, [a] for example 2 3 = 8.

  9. Help:Page history - Wikipedia

    en.wikipedia.org/wiki/Help:Page_history

    If you want to view a page's history, go to the page (e.g., Cat) and click the "View history" tab in the upper-right section of the screen. 10-minute video introduction to the View History feature A page history shows the order in which edits were made to any editable Wikipedia page, the difference between any two revisions, and a menu of ...