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  2. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Addition is commutative, meaning that one can change the order of the terms in a sum, but still get the same result. Symbolically, if a and b are any two numbers, then a + b = b + a. The fact that addition is commutative is known as the "commutative law of addition" or "commutative property of addition".

  3. Pre-assessment - Wikipedia

    en.wikipedia.org/wiki/Pre-assessment

    One of them is pre-assessment, which helps teachers better understand their students when preparing lessons, and activities to better fit the students in the class. Pre-assessment is a test that can be administered at the beginning of the school year and before new units. The same test may also be used for the post-assessment.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    With the large number of new areas of mathematics that have appeared since the beginning of the 20th century, defining mathematics by its object of study has become increasingly difficult. [174] For example, in lieu of a definition, Saunders Mac Lane in Mathematics, form and function summarizes the basics of several areas of mathematics ...

  5. Integrated mathematics - Wikipedia

    en.wikipedia.org/wiki/Integrated_mathematics

    Beginning with high school level courses, topics are usually separated so that one year a student focuses entirely on algebra (if it was not already taken in the eighth grade), the next year entirely on geometry, then another year of algebra (sometimes with trigonometry), and later an optional fourth year of precalculus or calculus. Precalculus ...

  6. Rehearsal letter - Wikipedia

    en.wikipedia.org/wiki/Rehearsal_letter

    A rehearsal letter, sometimes referred to as rehearsal marks, [1] [2] rehearsal figures, [3] or rehearsal numbers, is a boldface letter of the alphabet in an orchestral score, and its corresponding parts, that provides the conductor, who typically leads rehearsals, with a convenient spot to tell the orchestra to begin at places other than the start of movements or pieces.

  7. The Letter People - Wikipedia

    en.wikipedia.org/wiki/The_Letter_People

    Alpha One, also known as Alpha One: Breaking the Code, was a first and second grade program introduced in 1968, and revised in 1974, [8] that was designed to teach children to read and write sentences containing words containing three syllables in length and to develop within the child a sense of his own success and fun in learning to read by using the Letter People characters. [9]

  8. Eyewitness Books - Wikipedia

    en.wikipedia.org/wiki/Eyewitness_Books

    Eyewitness Books (called Eyewitness Guides in the UK) is a series of educational nonfiction books.They were first published in Great Britain by Dorling Kindersley in 1988. . The series now has over 160 titles on a variety of subjects, such as dinosaurs, Ancient Egypt, flags, chemistry, music, the solar system, film, and William Shakespe

  9. Lattice multiplication - Wikipedia

    en.wikipedia.org/wiki/Lattice_multiplication

    As an example, consider the multiplication of 58 with 213. After writing the multiplicands on the sides, consider each cell, beginning with the top left cell. In this case, the column digit is 5 and the row digit is 2. Write their product, 10, in the cell, with the digit 1 above the diagonal and the digit 0 below the diagonal (see picture for ...

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