Most scientific calculators offer statistical operations: calculating permutations (nPr), combinations
(nCr), and factorials (!). Newer calculators also have fraction and mixed number capabilities. Many
have two very useful keys—the ANS key and the ENTRY key. The ANS key is a substitute for typing in
the last calculated answer—saving time and avoiding errors. The ENTRY key will reenter the last
string of calculator keystrokes. This is handy for repeated calculations or to correct an incorrect
keystroke sequence.
In addition to all those features, graphing calculators have graphing features, including the ability
to:
Here are a few cautions when using calculators:
Parentheses
Exponents
Multiplication
Division
Addition
Subtractiondisplay graphs
find the intersection of simultaneous functions
find the roots of functions
display the associated table for a graphed function
find the equation for a table of values (regressions)
determine maximums and minimums of functionsKeep in mind that the graphing calculator graphs functions only. It is imperative that you
understand this if you try to graph a circle or an ellipse.
Don’t round any values until the final step in a problem. Rounding too soon could result in
an incorrect solution.
Always double-check the keystrokes that you enter. It is easy to make a mistake. The home
screen of a graphing calculator will allow you to see what was input even after the function is
executed.