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  2. Twenty-One Card Trick - Wikipedia

    en.wikipedia.org/wiki/Twenty-One_Card_Trick

    Mathematical explanation of the Twenty-one card trick with 27 cards: In each step, the cards are dealt into three piles. The piles are accumulated with the pile containing the target card (shaded yellow and labelled with the step number) put in the middle. After three steps, the middle card (*) is the one in all chosen piles.

  3. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

  4. Trachtenberg system - Wikipedia

    en.wikipedia.org/wiki/Trachtenberg_system

    The method for general multiplication is a method to achieve multiplications with low space complexity, i.e. as few temporary results as possible to be kept in memory. . This is achieved by noting that the final digit is completely determined by multiplying the last digit of the multiplic

  5. Kim's Game - Wikipedia

    en.wikipedia.org/wiki/Kim's_Game

    Kim's Game is a game or exercise played by Scouts, [1] the military, and other groups, in which a selection of objects must be memorised. The game develops a person's capacity to observe and remember details. The name is derived from Rudyard Kipling's 1901 novel Kim, in which the protagonist plays the game during his training as a spy. [2]

  6. Best Brain Training Games: Riddles, Brain Teasers, Puzzles ...

    www.aol.com/lifestyle/75-brain-games-guaranteed...

    Exercise your brain and sharpen your mind (the fun way!) with these 13 types of brain training games. The post Best Brain Training Games: Riddles, Brain Teasers, Puzzles, and More appeared first ...

  7. Three-card monte - Wikipedia

    en.wikipedia.org/wiki/Three-card_Monte

    To play three-card monte, a dealer places three cards face down on a table, usually on a cardboard box that provides the ability to set up and disappear quickly. [4] The dealer shows that one of the cards is the target card, e.g., the queen of hearts, and then rearranges the cards quickly to confuse the player about which card is which.

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