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  2. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    In what is known in the United States as traditional mathematics, a specific process is taught to students at the end of the 1st year (or during the 2nd year) for use with multi-digit whole numbers, and is extended in either the fourth or fifth grade to include decimal representations of fractional numbers.

  3. Casting out nines - Wikipedia

    en.wikipedia.org/wiki/Casting_out_nines

    The number 12565, for instance, has digit sum 1+2+5+6+5 = 19, which, in turn, has digit sum 1+9=10, which, in its turn has digit sum 1+0=1, a single-digit number. The digital root of 12565 is therefore 1, and its computation has the effect of casting out (12565 - 1)/9 = 1396 lots of 9 from 12565.

  4. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Since its beginning, mathematics was primarily divided into geometry and arithmetic (the manipulation of natural numbers and fractions), until the 16th and 17th centuries, when algebra [a] and infinitesimal calculus were introduced as new fields.

  5. Square root of 5 - Wikipedia

    en.wikipedia.org/wiki/Square_root_of_5

    Despite having a denominator of only 72, it differs from the correct value by less than ⁠ 1 / 10,000 ⁠ (approx. 4.3 × 10 −5). As of January 2022, the numerical value in decimal of the square root of 5 has been computed to at least 2,250,000,000,000 digits. [2]

  6. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    21.6 Converting Word document to PDF. 5 comments. 21.7 ... 22.25 6th grade science project-"what age ... please ask mathematics questions at the Mathematics ...

  7. Wikipedia:Language learning centre/Word list - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Language...

    Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.

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