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  2. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    For example, the set of integers modulo 12 has twelve elements; it inherits an addition operation from the integers that is central to musical set theory. The set of integers modulo 2 has just two elements; the addition operation it inherits is known in Boolean logic as the " exclusive or " function.

  3. Order of operations - Wikipedia

    en.wikipedia.org/wiki/Order_of_operations

    The Order of Operations emerged progressively over centuries. The rule that multiplication has precedence over addition was incorporated into the development of algebraic notation in the 1600s, since the distributive property implies this as a natural hierarchy. As recently as the 1920s, the historian of mathematics, Florian Cajori, identifies ...

  4. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    The main arithmetic operations are addition, subtraction, multiplication, and division. Arithmetic is an elementary branch of mathematics that studies numerical operations like addition, subtraction, multiplication, and division. In a wider sense, it also includes exponentiation, extraction of roots, and taking logarithms.

  5. Number line - Wikipedia

    en.wikipedia.org/wiki/Number_line

    The order of the natural numbers shown on the number line. A number line is a picture of a straight line that serves as spatial representation of numbers, usually graduated like a ruler with a particular origin point representing the number zero and evenly spaced marks in either direction representing integers, imagined to extend infinitely.

  6. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The first rule of addition is that only like quantities can be added; for example, various quantities of quarters. Unlike quantities, such as adding thirds to quarters, must first be converted to like quantities as described below: Imagine a pocket containing two quarters, and another pocket containing three quarters; in total, there are five ...

  7. Are Christmas trees toxic to cats? How to cat-proof your home ...

    www.aol.com/christmas-trees-toxic-cats-cat...

    No matter if you decorate immediately after Halloween or you wait until post-Thanksgiving, Christmas trees are a staple of the winter season. From balsam firs to pines and spruces to cedars, there ...

  8. Integer - Wikipedia

    en.wikipedia.org/wiki/Integer

    Like the natural numbers, is closed under the operations of addition and multiplication, that is, the sum and product of any two integers is an integer. However, with the inclusion of the negative natural numbers (and importantly, 0 ), Z {\displaystyle \mathbb {Z} } , unlike the natural numbers, is also closed under subtraction .

  9. Most overtimes in college football: Georgia-Georgia Tech game ...

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    No. 6 Georgia and Georgia Tech's Friday night football game kicked off at 7:30 p.m. ET. After 60 minutes of regulation — roughly four-and-a-half hours of real time — and an astounding eight ...

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