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2. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   A cake with one quarter (one fourth) removed. The remaining three fourths are shown by dotted lines and labeled by the fraction 1 ⁄ 4. A fraction (from Latin: fractus, "broken") represents a part of a whole or, more generally, any number of equal parts. When spoken in everyday English, a fraction describes how many parts of a certain size ...

3. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   The transition from activities to the formal Mathematical systems is guided by a variety of general insights and ideas. Another approach for defining mathematics is to use its methods. For example, an area of study is often qualified as mathematics as soon as one can prove theorems—assertions whose validity relies on a proof, that is, a ...

4. Field (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Field_(mathematics)

   Given an integral domain R, its field of fractions Q(R) is built with the fractions of two elements of R exactly as Q is constructed from the integers. More precisely, the elements of Q(R) are the fractions a/b where a and b are in R, and b ≠ 0. Two fractions a/b and c/d are equal if and only if ad = bc. The operation on the fractions work ...

5. K-5 (education) - Wikipedia

   en.wikipedia.org/wiki/K-5_(education)

   K-5 (pronounced "kay through five") is an American term for the education period from kindergarten to fifth grade. It receives equal amounts of criticism and support in the educational industry. It receives equal amounts of criticism and support in the educational industry.

6. Playfair's axiom - Wikipedia

   en.wikipedia.org/wiki/Playfair's_axiom

   The easiest way to show this is using the Euclidean theorem (equivalent to the fifth postulate) that states that the angles of a triangle sum to two right angles. Given a line ℓ {\displaystyle \ell } and a point P not on that line, construct a line, t , perpendicular to the given one through the point P , and then a perpendicular to this ...

7. Nelson Rockefeller - Wikipedia

   en.wikipedia.org/wiki/Nelson_Rockefeller

   The apartment was expanded by purchasing a floor of 812 Fifth Avenue. The two spaces connected via a flight of six steps. [138] Nelson and Happy Rockefeller used the entrance at 812 Fifth, while his first wife entered through 810 Fifth. [139] They remained married until his death. Rockefeller engaged in numerous extramarital affairs during his ...