Function Buttons
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The function buttons perform a special operation on the current value. The buttons are defined below:

btnsquareroot Square Root Button  
Calculates the square root of the current number. For example, 144 sqrt gives a result of 12.  
Keyboard = @  
 
 
btnpercent Percent Button  
Calculates a percentage of the previously entered number. For example, 50 + 10 % = 55. In this example, the Percent Button multiplies 50 by .10 and adds the result to 50. A percentage can also be subtracted, multiplied, or divided by a number in the same way by substituting the appropriate operator in the example above.  
Keyboard = %  
 
 
btnreciprocal Reciprocal Button  
Calculates the reciprocal of the current number. For example, 10 1/x gives a result of .1. In this example, the Reciprocal Button divides 1 by 10.  
Keyboard = R  
 
 
See also:
Numeric Buttons  
Operator Buttons  
Clear Buttons  
Memory Buttons