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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: [ˈdijɛnɛʃ]), 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. Living Books - Wikipedia

    en.wikipedia.org/wiki/Living_Books

    Living Books is a series of interactive read-along adventures aimed at children aged 3–9. Created by Mark Schlichting, the series was mostly developed by Living Books for CD-ROM and published by Broderbund for Mac OS and Microsoft Windows.

  4. Blackstone's ratio - Wikipedia

    en.wikipedia.org/wiki/Blackstone's_ratio

    Statue of William Blackstone located at Constitution Ave & 3rd St. NW, Washington, DC.. In criminal law, Blackstone's ratio (more recently referred to sometimes as Blackstone's formulation) is the idea that:

  5. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    In the figure, the fraction 1/9000 is displayed in Excel. Although this number has a decimal representation that is an infinite string of ones, Excel displays only the leading 15 figures. In the second line, the number one is added to the fraction, and again Excel displays only 15 figures. In the third line, one is subtracted from the sum using ...

  6. Earth Day - Wikipedia

    en.wikipedia.org/wiki/Earth_Day

    2011 Earth Day events included an environmental forum for local political leaders and the first-ever Earth Day celebration in Tunis City and primary school events throughout Iraq. In 17 of the world's most severely deforested countries, Earth Day Network completed a project to plant over 1.1 million trees. Across the globe, more than 100 ...

  7. 0.999... - Wikipedia

    en.wikipedia.org/wiki/0.999...

    The Archimedean property: any point x before the finish line lies between two of the points P n (inclusive).. It is possible to prove the equation 0.999... = 1 using just the mathematical tools of comparison and addition of (finite) decimal numbers, without any reference to more advanced topics such as series and limits.