Symbols
Each of the four basic arithmetic operations—addition, subtraction, multiplication, and division—is indicated by an appropriate symbol:
[+] add
[×] or [·] multiply
[–] subtract
[÷] or [/] divide
In addition to these operations, the following symbols are used to indicate equality or inequality:
= equals
≠ not equal
approximately equal to
> greater than
< less than
≥ greater than or equal to
≤ less than or equal to
Addition
Addition refers to the summation of a set of numbers. In adding numbers, there are two basic laws: the commutative law and the associative law.
The commutative law of addition states that the order in which numbers are added ...
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