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  2. Collatz conjecture - Wikipedia

    en.wikipedia.org/wiki/Collatz_conjecture

    The power of 3 multiplying a is independent of the value of a; it depends only on the behavior of b. This allows one to predict that certain forms of numbers will always lead to a smaller number after a certain number of iterations: for example, 4a + 1 becomes 3a + 1 after two applications of f and 16a + 3 becomes 9a + 2 after four applications ...

  3. Multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Multiplication_algorithm

    To multiply two numbers with n ... yields 36 and 9, the difference of which is 27, which is the product of 9 and 3. ... 2 ===== Answer: 1110 ton 7 cwt 2 qtr First ...

  4. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    Many common methods for multiplying numbers using pencil and paper require a multiplication table of memorized or consulted products of small numbers (typically any two numbers from 0 to 9). However, one method, the peasant multiplication algorithm, does not.

  5. 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.

  6. List of random number generators - Wikipedia

    en.wikipedia.org/wiki/List_of_random_number...

    A method with roots in number theory, although never used in practical applications. KISS: 1993 G. Marsaglia [21] Prototypical example of a combination generator. Multiply-with-carry (MWC) 1994 G. Marsaglia; C. Koç [22] [23] Complementary-multiply-with-carry (CMWC) 1997 R. Couture and P. L’Ecuyer [24] Mersenne Twister (MT) 1998

  7. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    But since the 7 is above the second set of numbers that number must be multiplied by 10. Thus, even though the answer directly reads 1.4, the correct answer is 1.4×10 = 14. For an example with even larger numbers, to multiply 88×20, the top scale is again positioned to start at the 2 on the bottom scale.

  8. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    The number for n = 6 had previously been estimated to be (1.7745 ± 0.0016) × 10 19. [65] [66] [63] Magic tori. Cross-referenced to the above sequence, a new classification enumerates the magic tori that display these magic squares. The number of magic tori of order n from 1 to 5, is: 1, 0, 1, 255, 251449712 (sequence A270876 in the OEIS).

  9. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5. As you would start on the number you are multiplying, when you multiply by 0, you stay on 0 (0 is external and so the arrows have no effect on 0, otherwise 0 is used as a link to create a perpetual cycle).