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  2. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    Elementary arithmetic is a branch of mathematics involving addition, subtraction, multiplication, and division. Due to its low level of abstraction, broad range of application, and position as the foundation of all mathematics, elementary arithmetic is generally the first branch of mathematics taught in schools. [ 1][ 2]

  3. Carry (arithmetic) - Wikipedia

    en.wikipedia.org/wiki/Carry_(arithmetic)

    Carry (arithmetic) In elementary arithmetic, a carry is a digit that is transferred from one column of digits to another column of more significant digits. It is part of the standard algorithm to add numbers together by starting with the rightmost digits and working to the left. For example, when 6 and 7 are added to make 13, the "3" is written ...

  4. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    Subtraction is an operation that represents removal of objects from a collection. [ 1] For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3.

  5. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    The nines' complement of a decimal digit is the number that must be added to it to produce 9; the nines' complement of 3 is 6, the nines' complement of 7 is 2, and so on, see table. To form the nines' complement of a larger number, each digit is replaced by its nines' complement. Consider the following subtraction problem:

  6. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    Addition. 3 + 2 = 5 with apples, a popular choice in textbooks [ 1] Addition (usually signified by the plus symbol +) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication and division. [ 2] The addition of two whole numbers results in the total amount or sum of those values combined.

  7. There's something odd about the stock market's concentration ...

    www.aol.com/finance/theres-something-odd-stock...

    But during that harrowing three-day slump, a funny thing happened: The Dow Jones Industrial Average — up only 3% this year versus 14% for the S&P 500 — staged a comeback. Energy perked up, and ...

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