© 2000 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI-15: A Guide for Teachers
39
Display, Scrolling, Order of
Operations, and Parentheses
1
Keys
1.
X
opens a parenthetical expression.
You can have as many as 8
parentheses at one time.
2.
Y
closes a parenthetical expression.
3.
!
and
"
move the cursor left and
right.
#
and
$
move the cursor up and
down through previous entries and
results.
Notes
•
The examples on the transparency
masters assume all default
settings.
•
The EOS
TM
transparency master
demonstrates the order in which
the TI-15 completes calculations.
•
When using parentheses, if you
press
®
before pressing
Y
,
Syn Error
is displayed.
•
Operations inside parentheses are
performed first. Use
X
or
Y
to
change the order of operations
and, therefore, change the result.
Example:
1 + 2 x 3 = 7
(1 + 2) x 3 = 9
•
The first and second lines display
entries up to 11 characters plus a
decimal point, a negative sign, and
a 2-digit positive or negative
exponent. Entries begin on the left
and scroll to the right. An entry will
always wrap at the operator.
•
Results are displayed right-
justified. If a whole problem will not
fit on the first line, the result will
display on the second line.
3
2
1
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