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  2. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    Common fractions can be positive or negative, and they can be proper or improper (see below). Compound fractions, complex fractions, mixed numerals, and decimals (see below) are not common fractions; though, unless irrational, they can be evaluated to a common fraction. A unit fraction is a common fraction with a numerator of 1 (e.g., ⁠ 1 / 7

  3. Investigations in Numbers, Data, and Space - Wikipedia

    en.wikipedia.org/wiki/Investigations_in_Numbers...

    Investigations in Numbers, Data, and Space is a K–5 mathematics curriculum, developed at TERC in Cambridge, Massachusetts, United States. The curriculum is often referred to as Investigations or simply TERC. Patterned after the NCTM standards for mathematics, it is among the most widely used of the new reform mathematics curricula.

  4. New Math - Wikipedia

    en.wikipedia.org/wiki/New_Math

    New Mathematics or New Math was a dramatic but temporary change in the way mathematics was taught in American grade schools, and to a lesser extent in European countries and elsewhere, during the 1950s–1970s.

  5. World Book Encyclopedia - Wikipedia

    en.wikipedia.org/wiki/World_Book_Encyclopedia

    A faithful effort has been made in the World Book to avoid this common defect." The encyclopedia's name would later be shortened to its current name World Book. [1] In 1919, World Book became the property of W.F. Quarrie & Company. The new owners created an editorial board to help make sure the entries were aligned with what students studied ...

  6. Multiplication sign - Wikipedia

    en.wikipedia.org/wiki/Multiplication_sign

    This notation is used wherever multiplication should be written explicitly, such as in "ab = a⋅2 for b = 2"; this usage is also seen in English-language texts. In some languages, the use of full stop as a multiplication symbol, such as a . b , is common when the symbol for decimal point is comma .

  7. World War II - Wikipedia

    en.wikipedia.org/wiki/World_War_II

    World War II [b] or the Second World War (1 September 1939 – 2 September 1945) was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries—including all the great powers—participated, with many investing all available economic, industrial, and scientific capabilities in pursuit of total war, blurring the distinction between military ...

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