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  2. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    A subtraction problem such as is solved by borrowing a 10 from the tens place to add to the ones place in order to facilitate the subtraction. Subtracting 9 from 6 involves borrowing a 10 from the tens place, making the problem into 70 + 16 − 39 {\displaystyle 70+16-39} .

  3. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    In grade schools, students are sometimes taught the method of complements as a shortcut useful in mental arithmetic. [3] Subtraction is done by adding the ten's complement of the subtrahend, which is the nines' complement plus 1. The result of this addition is used when it is clear that the difference will be positive, otherwise the ten's ...

  4. Subtraction game - Wikipedia

    en.wikipedia.org/wiki/Subtraction_game

    Subtraction games are generally impartial games, meaning that the set of moves available in a given position does not depend on the player whose turn it is to move.For such a game, the states can be divided up into -positions (positions in which the previous player, who just moved, is winning) and -positions (positions in which the next player to move is winning), and an optimal game playing ...

  5. Elementary mathematics - Wikipedia

    en.wikipedia.org/wiki/Elementary_mathematics

    A polygon is a 2-dimensional example of the more general polytope in any number of dimensions. A circle is a simple shape of two-dimensional geometry that is the set of all points in a plane that are at a given distance from a given point, the center.The distance between any of the points and the center is called the radius. It can also be ...

  6. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    [2] In a sense, subtraction is the inverse of addition. That is, c = a − b if and only if c + b = a. In words: the difference of two numbers is the number that gives the first one when added to the second one. Subtraction follows several important patterns. It is anticommutative, meaning that changing the order changes the sign of the answer.

  7. Madeline (video game series) - Wikipedia

    en.wikipedia.org/wiki/Madeline_(video_game_series)

    Similar to Madeline 1st and 2nd Grade, it follows Madeline on a tour of her neighborhood with a variety of activities. [8] Madeline 1st and 2nd Grade Math, the final game in the series, was released as a two-CD-ROM set on July 12, 1999. [12] The discs were also sold separately as Madeline 1st Grade Math and Madeline 2nd Grade Math.

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