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  2. 1729 (number) - Wikipedia

    en.wikipedia.org/wiki/1729_(number)

    [a] Furthermore, it is the first in the family of absolute Euler pseudoprimes, a subset of Carmichael numbers. [7] 1729 is divisible by 19, the sum of its digits, making it a harshad number in base 10. [8] 1729 is the dimension of the Fourier transform on which the fastest known algorithm for multiplying two numbers is based. [9]

  3. Napier's bones - Wikipedia

    en.wikipedia.org/wiki/Napier's_bones

    A small number is chosen, usually 2 through 9, by which to multiply the large number. In this example the small number by which to multiply the larger is 6. The horizontal row in which this number stands is the only row needed to perform the remaining calculations and may now be viewed in isolation. Second step of solving 6 x 425

  4. Multiple representations (mathematics education) - Wikipedia

    en.wikipedia.org/wiki/Multiple_representations...

    The use of multiple representations supports and requires tasks that involve decision-making and other problem-solving skills. [2] [3] [4] The choice of which representation to use, the task of making representations given other representations, and the understanding of how changes in one representation affect others are examples of such mathematically sophisticated activities.

  5. List of recreational number theory topics - Wikipedia

    en.wikipedia.org/wiki/List_of_recreational...

    This is a list of recreational number theory topics (see number theory, recreational mathematics). Listing here is not pejorative : many famous topics in number theory have origins in challenging problems posed purely for their own sake.

  6. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    Some of the algorithms Trachtenberg developed are for general multiplication, division and addition. Also, the Trachtenberg system includes some specialised methods for multiplying small numbers between 5 and 13. The section on addition demonstrates an effective method of checking calculations that can also be applied to multiplication.

  7. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    Using the same argument as before it becomes clear that the number on the gate is 13, and the ages 9, 2 and 2. [5] A criticism of this problem is that a household may have two children of the same age in terms of natural numbers, but different birthdays, such as children in a mixed-parent household.

  8. The 25-year fight to defeat West Nile virus, one convoy at a ...

    www.aol.com/25-fight-defeat-west-nile-142918880.html

    New York City health officials drive throughout Dyker Heights in Brooklyn, N.Y., on August 28, 2024, spraying a pesticide in the air to combat West Nile virus.

  9. Product (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Product_(mathematics)

    In mathematics, a product is the result of multiplication, or an expression that identifies objects (numbers or variables) to be multiplied, called factors.For example, 21 is the product of 3 and 7 (the result of multiplication), and (+) is the product of and (+) (indicating that the two factors should be multiplied together).