CALCULATOR
In addition to that list of necessary functions, there are other advantages to
using a scientific or graphing calculator.
Scientific calculators with a two-line display let users see what they are typing
before performing the operation, so they can catch input errors. Most
scientific calculators will also have parentheses keys; these calculators will
handle PEMDAS—order of operations.
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 re-enter the last string of calculator keystrokes. This is handy for repeated
calculations or to correct an incorrect keystroke sequence.
DON’T FORGET PEMDAS
Parentheses
Exponents
Multiplication
Division
Addition
Subtraction