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  2. Base ten blocks - Wikipedia

    en.wikipedia.org/wiki/Base_ten_blocks

    Wooden Dienes blocks in units of 1, 10, 100 and 1000 Plastic Dienes blocks in use. Base ten blocks, also known as Dienes blocks after popularizer Zoltán Dienes (Hungarian: [ˈdijÉ›nɛʃ]), are a mathematical manipulative used by students to practice counting and elementary arithmetic and develop number sense in the context of the decimal place-value system as a more concrete and direct ...

  3. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    A digit's value is the digit multiplied by the value of its place. Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point.

  4. 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 ...

  5. The ClueFinders 3rd Grade Adventures: The Mystery of Mathra

    en.wikipedia.org/wiki/The_ClueFinders_3rd_Grade...

    The game is the first in the series and depicts the first meeting of the ClueFinders and LapTrap [broken anchor], who goes on to appear in all the other ClueFinders games. The game ends with LapTrap being given to the ClueFinders and, in this respect, The Mystery of Mathra can be seen as an origin story for the rest of the series.

  6. ABCya - Wikipedia

    en.wikipedia.org/wiki/ABCya

    ABCya.com, L.L.C. (also stylized as ABCya!) is an American website that provides educational games and activities for school-aged children. The games on the website are organized into grade levels from pre-kindergarten to Sixth grade, as well as into subject categories such as letters, numbers, and holidays.

  7. Sudoku - Wikipedia

    en.wikipedia.org/wiki/Sudoku

    'digit-single'; originally called Number Place) [1] is a logic-based, [2] [3] combinatorial [4] number-placement puzzle. In classic Sudoku, the objective is to fill a 9 × 9 grid with digits so that each column, each row, and each of the nine 3 × 3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the ...

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