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2. 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.

3. 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.

4. 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]

5. Recovery efforts after Helene pose safety hazards after 30 ...

   www.aol.com/recovery-efforts-helene-pose-safety...

   October 5, 2024 at 6:06 PM. The unprecedented number of airplanes, helicopters and drones swooping in to help with post-Helene recovery efforts over the past week are now posing a safety hazard ...

6. Worksheet - Wikipedia

   en.wikipedia.org/wiki/Worksheet

   In accounting, a worksheet is, or was, a sheet of ruled paper with rows and columns on which an accountant could record information or perform calculations. These are often called columnar pads, and typically green-tinted. In computing, spreadsheet software presents, on a computer monitor, a user interface that resembles one or more paper ...

7. Negative number - Wikipedia

   en.wikipedia.org/wiki/Negative_number

   In mathematics, a negative number is the opposite (mathematics) of a positive real number. [ 1 ] Equivalently, a negative number is a real number that is less than zero. Negative numbers are often used to represent the magnitude of a loss or deficiency. A debt that is owed may be thought of as a negative asset.