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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 +. This is indicated by crossing out the 8, writing a 7 above it, and writing a 1 above the 6.

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Subtraction (which is signified by the minus sign −) is one of the four arithmetic operations along with addition, multiplication and division. Subtraction is an operation that represents removal of objects from a collection. [ 1 ]

  4. Keisan Game - Wikipedia

    en.wikipedia.org/wiki/Keisan_Game

    This particular game focuses on the basics of addition (たしざん) and subtraction (ひきざん), with one and two digits only. As a video game primarily meant for educational purposes, there is very little variety between the four modes of the game. Half of the modes are for addition, while the other half are for subtraction.

  5. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    The main arithmetic operations are addition, subtraction, multiplication, and division. Arithmetic is an elementary branch of mathematics that studies numerical operations like addition, subtraction, multiplication, and division. In a wider sense, it also includes exponentiation, extraction of roots, and taking logarithms.

  6. KenKen - Wikipedia

    en.wikipedia.org/wiki/KenKen

    KenKen and KenDoku are trademarked names for a style of arithmetic and logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto, [1] who intended the puzzles to be an instruction-free method of training the brain. [2] The name derives from the Japanese word for cleverness (賢, ken, kashiko(i)). [1]

  7. Nim - Wikipedia

    en.wikipedia.org/wiki/Nim

    Interactive subtraction game: Players take turns removing 1, 2 or 3 objects from an initial pool of 21 objects. The player taking the last object wins. In another game which is commonly known as nim (but is better called the subtraction game ), an upper bound is imposed on the number of objects that can be removed in a turn.

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