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2. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   In a sense, subtraction is the inverse of addition. That is, c = a − b if and only if c + b = a. In words: the difference of two numbers is the number that gives the first one when added to the second one. Subtraction follows several important patterns. It is anticommutative, meaning that changing the order changes the sign of the answer.

3. 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]

4. Exercise (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Exercise_(mathematics)

   At the Russian School of Mathematics, students begin multi-step problems as early as the first grade, learning to build on previous results to progress towards the solution. In the 1960s, collections of mathematical exercises were translated from Russian and published by W. H. Freeman and Company : The USSR Olympiad Problem Book (1962), [ 8 ...

5. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   It is in Babylonian mathematics that elementary arithmetic (addition, subtraction, multiplication, and division) first appear in the archaeological record. The Babylonians also possessed a place-value system and used a sexagesimal numeral system which is still in use today for measuring angles and time.

6. Key dates to remember between now and Trump's inauguration - AOL

   www.aol.com/key-dates-remember-between-now...

   The first former U.S. president to face criminal charges, Trump, for much of this year, faced four simultaneous prosecutions over allegations ranging from his attempt to cover up a hush money ...

7. Viral banana artwork has sold again — this time for $6.24 million

   www.aol.com/viral-banana-artwork-sold-again...

   Maurizio Cattelan’s viral creation, titled “Comedian,” has proven a sound investment for one collector: One of the artwork’s three “editions” smashed estimates to sell for $6.24 ...