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  2. 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 ...

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Then the subtraction proceeds by asking what number when increased by 1, and 5 is added to it, makes 7. The answer is 1, and is written down in the result's hundreds place. There is an additional subtlety in that the student always employs a mental subtraction table in the American method.

  4. Two-Minute Drill - Wikipedia

    en.wikipedia.org/wiki/Two-Minute_Drill

    Printable version; In other projects Wikidata item; ... Two-Minute Drill is a 2007 children's book by Mike Lupica and the first book in his Comeback Kids series. [1] [2]

  5. History of mathematics - Wikipedia

    en.wikipedia.org/wiki/History_of_mathematics

    From this derives the modern-day usage of 60 seconds in a minute, 60 minutes in an hour, and 360 (60 × 6) degrees in a circle, as well as the use of seconds and minutes of arc to denote fractions of a degree.

  6. Four-minute warning - Wikipedia

    en.wikipedia.org/wiki/Four-minute_warning

    The four-minute warning was a public alert system conceived by the British Government during the Cold War and operated between 1953 and 1992. The name derived from the approximate length of time from the point at which a Soviet nuclear missile attack against the United Kingdom could be confirmed and the impact of those missiles on their targets.

  7. Four-minute mile - Wikipedia

    en.wikipedia.org/wiki/Four-minute_mile

    New Zealand's John Walker, who with a 3:49.4 performance in August 1975 became the first man to run the mile under 3:50, ran 135 sub-four-minute miles during his career (during which he was the first person to run over 100 sub-four-minute miles), and American Steve Scott has run the most sub-four-minute miles, with 136.