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  2. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The second fraction, three quarters, is three times as large as one quarter, so two thirds of three quarters is three times as large as two thirds of one quarter. Thus two thirds times three quarters is six twelfths. A short cut for multiplying fractions is called cancellation. Effectively the answer is reduced to lowest terms during ...

  3. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In math, students learn about place value up to the millions, prime and composite numbers, multiplying 2-digit and 3-digit numbers, long division, fractions, decimals, the metric system, and geometry. In Social Studies, students learn about geography skills such as map reading and longitude and latitude, state history, and early American history.

  4. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Placard outside a shop in Bordeaux advertising subtraction of 20% from the price of the second perfume purchased. 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]

  5. Triangular number - Wikipedia

    en.wikipedia.org/wiki/Triangular_number

    Under this method, an item with a usable life of n = 4 years would lose ⁠ 4 / 10 ⁠ of its "losable" value in the first year, ⁠ 3 / 10 ⁠ in the second, ⁠ 2 / 10 ⁠ in the third, and ⁠ 1 / 10 ⁠ in the fourth, accumulating a total depreciation of ⁠ 10 / 10 ⁠ (the whole) of the losable value.

  6. Bone fracture - Wikipedia

    en.wikipedia.org/wiki/Bone_fracture

    A bone fracture (abbreviated FRX or Fx, F x, or #) is a medical condition in which there is a partial or complete break in the continuity of any bone in the body. In more severe cases, the bone may be broken into several fragments, known as a comminuted fracture. [1]

  7. Ordinal number - Wikipedia

    en.wikipedia.org/wiki/Ordinal_number

    The second number class is the set of ordinals whose predecessors form a countably infinite set. The set of all α having countably many predecessors—that is, the set of countable ordinals—is the union of these two number classes. Cantor proved that the cardinality of the second number class is the first uncountable cardinality. [12]

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