TI-83 Basics

1. Screen contrast:
2nd
and
up
^
or 
down 
v 
key.
2. Order of operations  = PEMDAS
Parenthesis
Exponant
Multiplication
Division
Addition
Subtraction

    Remember: When in doubt add parenthesis

    ie:    8 * 5 + 3 / 3  -vs-  (8 * 5 + 3) / 3
           6 ^ 3 - 2        -vs-  6 ^ (3 - 2)

 3. Subtraction key  -vs-  negative key.

                                                  FOR EXAMPLE:
 

 6  (-)  3  does not work and 6  -  3 does work
4.  To Reuse or edit a previous entry: 
2nd
and
ENTER
5.  To Reuse previous answer:
2nd
and
(-)
6. 
MODE
  Check for appropriate settings
7. 
2nd
DEL
 Inserts characters in text
CLEAR
 Clears screen
2nd
MODE
 Returns to home screen
DEL
 Deletes entry

 
8.  Programing  Fractions: MATH
Select "1: >Frac"

                                            FOR EXAMPLE:
 

ie: 6/9
ENTER
  
.6666666667
2nd
 and
(-)
ANS MATH Select "1: >Frac"
ANS> FRAC ENTER
2/3
9.  Use of the  STO=> key

                                            FOR EXAMPLE:
 

2/3
STO =>
ANS
ALPHA
 Select a letter; ie: 'A'
ANS-A
ENTER
.6666666667 Now A * 3 = 2

 
On Your Own : Experiment with the  2nd  and  +  keys for resetting calculator and memory management!