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  2. Subtract a square - Wikipedia

    en.wikipedia.org/wiki/Subtract_a_square

    A normal play game starting with 13 coins is a win for the first player provided they start with a subtraction of 1: player 1: 13 - 1*1 = 12 Player 2 now has three choices: subtract 1, 4 or 9. In each of these cases, player 1 can ensure that within a few moves the number 2 gets passed on to player 2:

  3. 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 ...

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  5. Four square - Wikipedia

    en.wikipedia.org/wiki/Four_square

    Four square is played on any hard-surfaced court, such as wood, concrete or asphalt.There is no official court size, but typically courts measure between 10 and 30 feet (3.0 and 9.1 meters) on a side, and divided into four smaller squares labelled 1–4 of equal size.

  6. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    Elementary arithmetic is a branch of mathematics involving addition, subtraction, multiplication, and division. Due to its low level of abstraction , broad range of application, and position as the foundation of all mathematics, elementary arithmetic is generally the first branch of mathematics taught in schools.

  7. Chunking (division) - Wikipedia

    en.wikipedia.org/wiki/Chunking_(division)

    In the UK, this approach for elementary division sums has come into widespread classroom use in primary schools since the late 1990s, when the National Numeracy Strategy in its "numeracy hour" brought in a new emphasis on more free-form oral and mental strategies for calculations, rather than the rote learning of standard methods.

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