Introduction To The Display; Clearing And Correcting - Texas Instruments TI-15 Explorer Owner's Manual

1. Introduction to the Display

a. Using your thumbs, press and hold down both and  at the same time, then
release both keys at the same time. MEM CLEARED is displayed.
This RESETS the calculator to its default settings.
b. Press . The blinking triangle cursor is displayed. The calculator is ready to use.
c. Key in . 10 x 10 = 100 is displayed.
You can see both the problem and the answer at the same time.
d. Now key in  (10 x 9 = 90 is displayed), and  (10 x 8 = 80
is displayed). The "up arrow" indicator in the calculator window lets you know that
you can scroll up.
e
.  and  move the cursor left and right,
up and down through previous entries.
A small arrow will appear at the left hand side of the screen when
this is possible.
f.  is used to open an expression with brackets,
and must be used to close before selecting ,
otherwise Syn error is displayed.
Operations in brackets are always performed first.
You can review entries and look for patterns.
In terms of priority, the calculator will perform in the following order:
g.
 Brackets  and 
 Fractions 
 Exponents and square roots  and 
 Negative 
 Multiply and divide  and 
 Add and subtract  and 
 Convert to fraction or decimal 
 Complete 
 NB Since the calculator will always do what is in brackets first, the use of
brackets can change the required order and so change the answer or result.

Clearing and correcting

h.

 turns the calculator on and off, but will not clear settings or previous
entries.
  clears only the last entry and any error statements. It does not affect mode
settings, memory or constants.
 and  move the cursor
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