The following is for Kindle 3, but I dare say some of it will work for you on K4. It's also well-worth reading the rest of the page for other quirky tricks that MIGHT still function on K4:
Quote:
Kindle Calculations
The search window can be used as a simple calculator. Steven Ehrbar has kindly provided most of these details:
Standard operators are + (addition), – (subtraction), * (multiplication), / (division), % (modulus), and ^ (exponentiation).
Parentheses () work for grouping, {} and [] do not.
You can assign values to variables with =; for example, test=9.
The results of the last operation are stored in the variable _ (underscore).
Assign _ to a variable before using it in further calculations. I have found that using _ directly results in the calculation being done twice. For example, if you enter 5*2, then _ is 10. Entering _*2 results in 40, not 20. However, if you enter y=_, you get a result of y = _ = 10. y*2 then correctly results in 20.
The values of pi and e are stored in pi and e, respectively.
Functions, which work on a value or expression in the parentheses, are:
Trig functions: acos(), asin(), atan(), cos(), cosh(), sin(), sinh(), tan(), tanh()
Arguments for trig functions must be in radians
radians = degrees * (pi/180)
You can assign pi/180 to a variable (eg k=pi/180)
To find the tan of 10°, you can then type tan(10*k)
Other functions: abs() [absolute value], exp() [e to the power of], ln() [natural logarithm], log() [base 10 logarithm], sqrt() [square root].
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http://blog.diannegorman.net/2010/09...ortcuts-et-al/