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  2. Grid method multiplication - Wikipedia

    en.wikipedia.org/wiki/Grid_method_multiplication

    The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.

  3. Dots and boxes - Wikipedia

    en.wikipedia.org/wiki/Dots_and_Boxes

    Example game of Dots and Boxes on a 2×2 square board. The second player ("B") plays a rotated mirror image of the first player's moves, hoping to divide the board into two pieces and tie the game. But the first player ("A") makes a sacrifice at move 7 and B accepts the sacrifice, getting one box.

  4. Power Grid - Wikipedia

    en.wikipedia.org/wiki/Power_Grid

    Power Grid is the English-language version of the second edition of the multiplayer German-style board game Funkenschlag, designed by Friedemann Friese and first released in 2004. Power Grid was released by Rio Grande Games. In the game, each player represents a company which owns power plants and tries to supply electricity to cities.

  5. Double counting (proof technique) - Wikipedia

    en.wikipedia.org/wiki/Double_counting_(proof...

    Where double counting involves counting one set in two ways, bijective proofs involve counting two sets in one way, by showing that their elements correspond one-for-one. The inclusion–exclusion principle , a formula for the size of a union of sets that may, together with another formula for the same union, be used as part of a double ...

  6. Dot planimeter - Wikipedia

    en.wikipedia.org/wiki/Dot_planimeter

    When counting dots near the boundary of the shape as 1/2, there are 69 interior dots and 20 boundary dots for an estimated area of 79, close to the actual area of 25 π ≈ 78.54. A dot planimeter is a device used in planimetrics for estimating the area of a shape, consisting of a transparent sheet containing a square grid of dots. To estimate ...

  7. Defense Grid 2 - Wikipedia

    en.wikipedia.org/wiki/Defense_Grid_2

    Defense Grid 2 is a 2014 tower defense video game developed by Hidden Path Entertainment and published by 505 Games. As a sequel to the 2008 Defense Grid: The Awakening , the game was crowd-funded on Kickstarter in 2012 [ 4 ] and released on Windows , Xbox One , and PlayStation 4 on September 23, 2014.

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