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  2. 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

  3. 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]

  4. 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.

  5. 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 ...

  6. Tips & Tricks: How to Play Bubble Town (and Other Bubble ...

    www.aol.com/news/2009-07-29-tips-and-tricks-how...

    The basic principle in these games is simple -- match three or more of the same bubble by shooting new ones from the bottom of the screen to the rows towards the top.

  7. Out of This World (card trick) - Wikipedia

    en.wikipedia.org/wiki/Out_of_This_World_(card_trick)

    The performer takes a deck of cards, and places on the table two face-up "marker" cards, one black and one red; the black on the left and the red on the right.The performer tells the spectator that he or she is going to deal cards face-down from the deck and the object of the exercise is for the subject to use their intuition to identify whether each card in the deck is black or red.