Basic Arithmetic 
Keys, Parentheses 
The four basic operators. Each is used in the same way as a standard calculator:
+ (addition), – (subtraction), x (multiplication), and ⎟ (division).
Finds the result in the same way as a standard calculator.
Used to specify calculations in which certain operations have precedence. You can make addition and subtraction operations have precedence over multiplication and division by enclosing them in parentheses.
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