Texas Instruments TI-73 Explorer Manual

7/02/01 ©1999, 2001 Texas Instruments
Number Line /
Fraction Line for the
TI-73
Getting Started
Start here
How To…
Find Installation Instructions
Start Number Line
Enter expressions
Trace the vector history
Start Fraction Line
Enter Fraction Line Data
Adjust window values
Convert Fraction Line labels
More Information
Uninstalling the Application from the TI-73
Error Recovery
Customer Support
TI

Number Line/Fraction Line for the TI-73 Page 2
Important Information
Texas Instruments makes no warranty, either expressed or
implied, including but not limited to any implied warranties of
merchantability and fitness for a particular purpose, regarding
any programs or book materials and makes such materials
available solely on an “as-is” basis.
In no event shall Texas Instruments be liable to anyone for
special, collateral, incidental, or consequential damages in
connection with or arising out of the purchase or use of these
materials, and the sole and exclusive liability of Texas
Instruments, regardless of the form of action, shall not exceed
the purchase price of this product. Moreover, Texas Instruments
shall not be liable for any claim of any kind whatsoever against
the use of these materials by any other party.
This graphing product application (APP) is licensed. See the
terms of the license agreement.
Copyright © 1999, 2001 Texas Instruments Incorporated.

Number Line/Fraction Line for the TI-73 Page 3
Where to Find Installation Instructions
You can find detailed instructions on installing Flash applications
at education.ti.com/guides.

Number Line/Fraction Line for the TI-73 Page 4
What is Number Line / Fraction Line?
This application contains two parts: Number Line and
Fraction Line.
Number Line gives a dynamic, electronic representation of a
number line. It includes three data representations — an entry
line, a vector history, and the number line itself with an indicator
showing the current position of the entry.
Use Number Line when you want to create a numerical
expression by adding and/or subtracting positive and/or negative
whole numbers. You can then view the vector history. You can
also see where the ending point (result of the expression) falls
on a number line. As you edit an entry, the vector history and
ending point adjust, as necessary.
Fraction Line gives a dynamic, electronic representation of a
double-sided number line. Each side of the number line may be
configured to represent numbers as decimals, fractions, or
percentages.
Use Fraction Line when you want to label a number line with a
fraction, decimal, percent, or whole number. You can then use
the labels to compare between many types of numbers at the
same time.

Number Line/Fraction Line for the TI-73 Page 5
Number Line
Starting Number Line
1. Press 9.
The APPLICATIONS menu is displayed.
2. Select NUMLINE from the menu. (Press
the number corresponding to the menu
option, or press the down arrow key
until the number is highlighted, then
press b.)
An information screen is displayed.
3. Press any key to continue.
The NUN/FRAC LINE menu is displayed.

Number Line/Fraction Line for the TI-73 Page 6
4. Select 1:Number Line from the menu.
The Number Line application screen
and any previous entries are displayed.
If necessary, press :, and then
select 1:Yes from the menu to clear
previous entries.
Number Line Options
With Number Line, you can add and subtract positive and
negative values on a number line. After entering the numerical
expression on the entry line, you can then edit or clear the entry,
trace the vectors, adjust the appearance of the number line, and
label various points on it. The first time the Number Line runs,
the line indicator is shown at the default starting point, 0. No
previous entries are shown arithmetically or in vectors, since no
previous information has been entered.

Number Line/Fraction Line for the TI-73 Page 7
Below is a screen with an example of the equation 0 + 5-7 - L4 = 2.
The default WINDOW values: Min=N20, Max=20, Scale=2, Start=0.
For more information, see section entitled, Adjusting the Number
Line WINDOW Values.
Entering an Expression
Enter the numerical expression on the entry line. The expression
can consist of positive and/or negative whole numbers that are
added or subtracted. Therefore, you can use the following keys:
all number keys, \, Tand a. Enter the values as you would on
the Home screen of the TI-73.
You can add a positive value in two ways:
•Use \to add a positive number. Example: 10 + 5 = 15.
•Use Tato subtract a negative number.
Example: 10 NL5 = 15
entry line
vector history
number line indicator
showing current position
at 2

Number Line/Fraction Line for the TI-73 Page 8
Pressing a number without pressing an operator (\or T)
defaults to a positive number (+) and adds an entry to the
expression. Example: Pressing 6defaults to +6.
You can negate a number in two ways:
•Use ato add a negative number. Example: 10 + L5 = 5
•Use
Tto subtract a positive number. Example: 10 N5 = 5
When you finish entering the expression, press b. The
numerical result is displayed at the end of the expression on the
entry line, the vector history is also displayed, and the indicator is
adjusted so that it points to the result on the number line.
Note
You can press bafter a single entry or after multiple entries.

Number Line/Fraction Line for the TI-73 Page 9
Editing Entries
To edit the expression, press bor &to move the cursor to
the entry line and enter Edit mode. Edit the entry using the
following edit keys.
Press:
To:
b
Move to the beginning of the entry line to start editing
!or "
Move between characters on the entry line
-!
Move to the beginning of the entry line from another
position
-"
Move to the end of the entry line
/
Delete character at the cursor
-m
Insert a character in front of the cursor
:
Clear all entries (If you are not in Edit mode, you will be
asked to confirm that you want to clear the entire
expression. Press 1to select Yes.)
b
Finish editing and update the expression, vector, and
number line

Number Line/Fraction Line for the TI-73 Page 10
Tracing the Vector History
You can trace the vector history just as you would trace a
function graph on the TI-73.
Press )to enter Trace mode. You see two cursors: a vector
cursor and a corresponding number line cursor. As both cursors
move simultaneously, the exact corresponding x-value is
displayed at the bottom left corner of the screen. The entry line
only displays the expression without its numerical result.
The cursor traces in increments according to the Scale value set
on the WINDOW screen. For more information on WINDOW
values, see the section entitled, Adjusting the Number Line
Window Values.