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2. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Addition is a mathematical operation that combines two or more numbers (called addends or summands) to produce a combined number (called the sum). The addition of two numbers is expressed with the plus sign (+). [6] It is performed according to these rules: The order in which the addends are added does not affect the sum.

3. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   In modular arithmetic, the set of available numbers is restricted to a finite subset of the integers, and addition "wraps around" when reaching a certain value, called the modulus. 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.

4. Number sentence - Wikipedia

   en.wikipedia.org/wiki/Number_sentence

   A valid number sentence that is false: 1 + 1 = 3. A valid number sentence using a 'less than' symbol: 3 + 6 < 10. A valid number sentence using a 'more than' symbol: 3 + 9 > 11. An example from a lesson plan: [6] Some students will use a direct computational approach.

5. List of integer sequences - Wikipedia

   en.wikipedia.org/wiki/List_of_integer_sequences

   Download as PDF; Printable version; In other projects ... is the number of positive integers not greater than n that are coprime with n. ... otherwise add": a(0) ...

6. Warning sign of type 2 diabetes: 7 ways to reverse prediabetes

   www.aol.com/warning-sign-type-2-diabetes...

   Prediabetes is almost always a precursor to type 2 diabetes — but it doesn’t have to lead to that outcome. Experts share healthy steps to reverse the condition.

7. Some breast cancer patients can avoid certain surgeries ... - AOL

   www.aol.com/breast-cancer-patients-avoid-certain...

   Some early breast cancer patients can safely avoid specific surgeries, according to two studies exploring ways to lessen treatment burdens.. One new study, published in the New England Journal of ...