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

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

    Investigations was developed between 1990 and 1998. It was just one of a number of reform mathematics curricula initially funded by a National Science Foundation grant. The goals of the project raised opposition to the curriculum from critics (both parents and mathematics teachers) who objected to the emphasis on conceptual learning instead of instruction in more recognized specific methods ...

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Both these methods break up the subtraction as a process of one digit subtractions by place value. Starting with a least significant digit, a subtraction of the subtrahend: s j s j−1... s 1. from the minuend m k m k−1... m 1, where each s i and m i is a digit, proceeds by writing down m 1 − s 1, m 2 − s 2, and so forth, as long as s i ...

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The four color theorem and optimal sphere packing were two major problems of discrete mathematics solved in the second half of the 20th century. [44] The P versus NP problem , which remains open to this day, is also important for discrete mathematics, since its solution would potentially impact a large number of computationally difficult problems.

  5. Exercise (mathematics) - Wikipedia

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

    At the Russian School of Mathematics, students begin multi-step problems as early as the first grade, learning to build on previous results to progress towards the solution. In the 1960s, collections of mathematical exercises were translated from Russian and published by W. H. Freeman and Company : The USSR Olympiad Problem Book (1962), [ 8 ...

  6. Number line - Wikipedia

    en.wikipedia.org/wiki/Number_line

    The order of the natural numbers shown on the number line. A number line is a graphical representation of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

  7. Exercise book - Wikipedia

    en.wikipedia.org/wiki/Exercise_book

    Although available in several colors, the original marbled black-and-white cover, with its generic label on the front, is the most common. Typically, they have dimensions of 9 + 3 ⁄ 4 by 7 + 1 ⁄ 2 inches (250 mm × 190 mm) or 8 + 1 ⁄ 2 by 6 + 7 ⁄ 8 inches (220 mm × 170 mm) and 20, 40, 80 or 100 sheets. Composition books can be ruled or ...