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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] On the basis of this, and of the average score of this group of 10 students, the author concluded that "although they did ...

  3. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    They are commonly given to students as homework. The second type of math worksheet is intended to introduce new topics, and are often completed in the classroom. They are made up of a progressive set of questions that leads to an understanding of the topic to be learned. [2] Parents also need worksheets. [3]

  4. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In math, students learn about place value up to the millions, prime and composite numbers, multiplying 2-digit and 3-digit numbers, long division, fractions, decimals, the metric system, and geometry. In Social Studies, students learn about geography skills such as map reading and longitude and latitude, state history, and early American history.

  5. Grid method multiplication - Wikipedia

    en.wikipedia.org/wiki/Grid_method_multiplication

    Because it is often taught in mathematics education at the level of primary school or elementary school, this algorithm is sometimes called the grammar school method. [1] Compared to traditional long multiplication, the grid method differs in clearly breaking the multiplication and addition into two steps, and in being less dependent on place ...

  6. Tally marks - Wikipedia

    en.wikipedia.org/wiki/Tally_marks

    Tally marks used in France, Portugal, Spain, and their former colonies, including Latin America. 1 to 5 and so on. These are most commonly used for registering scores in card games , like Truco . In the dot and line (or dot-dash) tally, dots represent counts from 1 to 4, lines 5 to 8, and diagonal lines 9 and 10.

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