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

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

    Although negative numbers are not taught in the 2nd grade, "constructivist" student subtracting 9 from 28 explains that "8 minus 9 equals negative 1" and then argues that "-1 plus 20 is the same as 20-1 and equals 19."

  3. English Braille - Wikipedia

    en.wikipedia.org/wiki/English_Braille

    English Braille, also known as Grade 2 Braille, [1] is the braille alphabet used for English. It consists of around 250 letters ( phonograms ), numerals, punctuation, formatting marks, contractions, and abbreviations ( logograms ). Some English Braille letters, such as â ¡ ch , [2] correspond to more than one letter in print.

  4. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Subtraction is an operation that represents removal of objects from a collection. [1] For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3.

  5. Academic grading in the United States - Wikipedia

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

    In some places, .25 or .3 instead of .33 is added for a plus grade and subtracted for a minus grade. Other institutions maintain a mid-grade and award .5 for the grade. For example, an AB would receive a 3.5-grade point and a BC would receive a 2.5-grade point.

  6. Flesch–Kincaid readability tests - Wikipedia

    en.wikipedia.org/wiki/Flesch–Kincaid...

    "The Flesch–Kincaid" (F–K) reading grade level was developed under contract to the U.S. Navy in 1975 by J. Peter Kincaid and his team. [1] Related U.S. Navy research directed by Kincaid delved into high-tech education (for example, the electronic authoring and delivery of technical information), [2] usefulness of the Flesch–Kincaid readability formula, [3] computer aids for editing tests ...

  7. Meet the engineer, doctors and other clock punchers ... - AOL

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