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  2. Guess 2/3 of the average - Wikipedia

    en.wikipedia.org/wiki/Guess_2/3_of_the_average

    Therefore, any guess above ⁠44 + 4 / 9 ⁠ is weakly dominated for every player since no player will guess above ⁠66 + 2 / 3 ⁠, and ⁠ 2 / 3 ⁠ of ⁠66 + 2 / 3 ⁠ is ⁠44 + 4 / 9 ⁠. This process will continue as this logic is continually applied, If the same group of people play the game consistently, with each step, the highest ...

  3. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The entire fraction may be expressed as a single composition, in which case it is hyphenated, or as a number of fractions with a numerator of one, in which case they are not. (For example, two-fifths is the fraction ⁠ 2 / 5 ⁠ and two fifths is the same fraction understood as 2 instances of ⁠ 1 / 5 ⁠.) Fractions should always be ...

  4. Ancient Egyptian multiplication - Wikipedia

    en.wikipedia.org/wiki/Ancient_Egyptian...

    In mathematics, ancient Egyptian multiplication (also known as Egyptian multiplication, Ethiopian multiplication, Russian multiplication, or peasant multiplication), one of two multiplication methods used by scribes, is a systematic method for multiplying two numbers that does not require the multiplication table, only the ability to multiply and divide by 2, and to add.

  5. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    43×5 = 215 Half of 3's neighbor is 0, plus 5 because 3 is odd, is 5. Half of 4's neighbor is 1. Half of the leading zero's neighbor is 2. 93×5=465 Half of 3's neighbor is 0, plus 5 because 3 is odd, is 5. Half of 9's neighbor is 1, plus 5 because 9 is odd, is 6. Half of the leading zero's neighbor is 4.

  6. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Animation demonstrating how the method excludes incorrect cards each time a pile is selected, leaving the selected card in position 11. When the cards are dealt out the second time, the selection will be the third, fourth, or fifth card in the pile it ends up in. In picking up the piles, the magician places this pile between the other two again.

  7. Kirkman's schoolgirl problem - Wikipedia

    en.wikipedia.org/wiki/Kirkman's_schoolgirl_problem

    In addition to S(2,3,9), Kramer and Mesner examined other systems that could be derived from S(5,6,12) and found that there could be up to 2 disjoint S(5,6,12) systems, up to 2 disjoint S(4,5,11) systems, and up to 5 disjoint S(3,4,10) systems. All such sets of 2 or 5 are respectively isomorphic to each other.

  8. Al-Khwarizmi - Wikipedia

    en.wikipedia.org/wiki/Al-Khwarizmi

    For example, x 2 = 40x − 4x 2 is reduced to 5x 2 = 40x. Al-muqābala is the process of bringing quantities of the same type to the same side of the equation. For example, x 2 + 14 = x + 5 is reduced to x 2 + 9 = x. The above discussion uses modern mathematical notation for the types of problems that the book discusses.

  9. Multiplication - Wikipedia

    en.wikipedia.org/wiki/Multiplication

    For instance, the product of three factors of two (2×2×2) is "two raised to the third power", and is denoted by 2 3, a two with a superscript three. In this example, the number two is the base, and three is the exponent. [26] In general, the exponent (or superscript) indicates how many times the base appears in the expression, so that the ...