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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

    Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics, most notably in Euclid's Elements. [4] Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions ), until the 16th and 17th centuries, when algebra [ a ...

  4. Secondary education in the United States - Wikipedia

    en.wikipedia.org/wiki/Secondary_education_in_the...

    These certifications can overlap. In Missouri, for example, middle school certification covers grades 6–8, elementary school certification covers kindergarten to grade 5, and high school certification covers grades 9–12. This reflects the wide range of grade combinations of middle schools, junior high schools, and elementary schools.

  5. Academic grading in the United States - Wikipedia

    en.wikipedia.org/wiki/Academic_grading_in_the...

    A-plusses, if given, are usually assigned a value of 4.0 (equivalent to an A) due to the common assumption that a 4.00 is the best possible grade-point average, although 4.33 is awarded at some institutions. In some places, .25 or .3 instead of .33 is added for a plus grade and subtracted for a minus grade.

  6. Playfair's axiom - Wikipedia

    en.wikipedia.org/wiki/Playfair's_axiom

    It is equivalent to Euclid's parallel postulate in the context of Euclidean geometry [2] and was named after the Scottish mathematician John Playfair. The "at most" clause is all that is needed since it can be proved from the first four axioms that at least one parallel line exists given a line L and a point P not on L , as follows:

  7. 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.

  8. Iran - Wikipedia

    en.wikipedia.org/wiki/Iran

    Iran, [a] [b] officially the Islamic Republic of Iran (IRI) [c] and also known as Persia, [d] is a country in West Asia.It borders Turkey to the northwest and Iraq to the west, Azerbaijan, Armenia, the Caspian Sea, and Turkmenistan to the north, Afghanistan to the east, Pakistan to the southeast, the Gulf of Oman and the Persian Gulf to the south.

  9. United States Army - Wikipedia

    en.wikipedia.org/wiki/United_States_Army

    US DoD pay grade Special E-9 E-8 E-7 E-6 E-5 E-4 E-3 E-2 E-1 NATO code: OR-9 OR-8 OR-7 OR-6 OR-5 OR-4 OR-3 OR-2 OR-1 Uniform insignia No insignia; Title Senior enlisted advisor to the chairman: Sergeant major of the Army: Senior enlisted advisor to the chief of the National Guard Bureau: Command sergeant major: Sergeant major: First sergeant ...

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