TI – 73
A Quick Reference
Presentation
for AMSTI
Year 1 Training
Previewing Keyboard
• To turn on, press ON.
• To turn off, press 2nd ON.
• To darken screen, toggle
2nd and p (up cursor).
Notice the changing
number in the upper right
corner. The higher the
number the darker the
screen.
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Previewing
Keyboard
• To lighten screen, toggle
2nd and q (down cursor).
Notice the changing
number in the upper right
corner. The lower the
number the lighter the
screen.
• If the screen display must
be set at 8 or higher to be
visible, it is time to change
the batteries.
3
Previewing
Keyboard
• The “2nd functions” of the
calculator are written in
yellow above the keys.
• Once you press 2nd, the
cursor will change to an up
arrow.
• Find the square root of a
number.
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Previewing
Keyboard
• There are many menus
and embedded menus in
the graphing calculator.
Should you find yourself
“lost”, you can return to
the home screen by using
2nd QUIT. ( “Quit and go
home”).
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Previewing
Keyboard
• The home screen is
available for normal
calculator
computations.
• Home screen cursor is
a black square.
• 2nd function cursor
shows a white arrow
in the square. h
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Basic Calculations
• For basic calculations, type
an expression and press
ENTER for the answer.
• The calculator follows the
order of operations.
• Notice how the
multiplication and division
signs look on the screen.
Why do they look like this?
• How do you enter
exponents?
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Previewing Keyboard
• 2nd TEXT enters
alphabetic characters
(offer students a few
minutes to enter a
message before
continuing).
• Do not use TEXT to enter
variables.
• X enters a variable.
8
Previewing Keyboard
• Edit an entry using the
backspace cursor,
DEL, or 2nd INS keys
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Clean-Up Procedure
Clean up time –
Returns display to the
best settings for future
work!
Follow the triangular
pattern
formed by the keys:
Y=, ZOOM, and MODE.
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Clean-Up Procedure
Check MODE
All menu items
should be highlighted
on the left.
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Clean-Up Procedure
Clear
y=
This step is optional,
but works well with
students to get them
all on the same page.
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Clean-Up Procedure
 Zoom 6
This step sets your
window at a standard
setting. It may be
adjusted later either
manually or with the
Zoom feature.
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Optional
Clean-Up Procedure
Check Plots
off
To check plots you
must use the 2nd key.
This step is a great
troubleshooter.
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Optional
Clean-Up Procedure
 Format
To check FORMAT you
must use the 2nd key.
Highlight items on the
left. This step is a good
Troubleshooter, also.
15
Zoom
Zoom is used to quickly
adjust the display
window.
Frequently used zoom
keys:
•2: Zoom In.
•3: Zoom Out.
•5: Zoom Square.
•6: ZStandard
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Window
Window is used to
manually set the
window for the best
display of the graph
instead of using the
Zoom feature.
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Window
•Xmin and Xmax give the
bounds on the x-axis
•Ymin and Ymax give the
bounds on the y-axis
•Xscl and Yscl control the
intervals between tick marks
on the axes
•Xres controls how finely it
is drawn and generally
should be left alone.
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Trace
Trace is used to move a
point along a graph,
showing its x and y
values.
•Use the up and down
arrows to jump from one
graph to another.
•Use the right and left
arrows to move the point
along a graph.
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Practice Editing, Using Y = ,
and Graphing
• Press Y =
• Complete the equation with:
– 3x4 + 10x – 4
• Edit the equation to:
– 3x2 + 7x + 4
• Press GRAPH
• To view a table of x, y values for the graph,
press TABLE (2nd GRAPH).
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Practice Editing, Using Y = ,
and Graphing
• Suppose you want to prove that
3(x + 5) is not equal to 3x + 5, but is
equal to 3x + 15.
• Type all three equations onto the Y =
screen.
• Highlight the “=“ on Y3 = 3x + 15,
press ENTER to toggle off the “=“, so
that this equation will not be graphed.
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Practice Editing, Using Y = ,
and Graphing
• Press GRAPH. Two distinct lines are
graphed, so the equations are not the
same.
• Turn off Y2 = 3x + 5, and turn on Y1
and Y3. GRAPH. Only one line
appears, so the two equations are the
same.
• Verify values by using TABLE.
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Stat
LIST and STAT are
used to enter data
into lists and
manipulate them.
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Stat
• To enter data into a chosen
list, press LIST.
• Enter data in list 1 (L1) or
use arrows to move to other
lists.
• Formulas may be entered in
lists.
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Using STAT to
Average Grades
• Press LIST.
• Under L1 list 4 student
ID numbers (cannot
use names).
• Under L2 list each
student’s score on the
first test: 84, 97, 86,
75.
25
Using STAT to
Average Grades
• Under L3 list 2nd test
scores: 87, 89, 95, 84.
• Above L4 type the
averaging formula and
enter: (L2 + L3)/2.
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How could each average
be shown as rounded to
the nearest whole
number?
• Go to MODE
and select Float
0 decimal
places.
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Using STAT
• This is a great tool to use
with Investigation 7 in
CMP’s Covering and
Surrounding to derive pi.
• Use L1 for circumference
data.
• Use L2 for diameter data.
• Enter the ratio C/D as a
formula in L3. See what
happens.
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Stat Plot
STAT PLOT is used to graph
data from selected lists.
• Turn Plot on.
• Select type of graph.
• Select list(s) of data.
• Choose type of
plotting mark.
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Using STAT PLOT to
Make Scatter Plots
To clear old data:
• Press LIST
• Place cursor on List
heading
• Press CLEAR and
ENTER
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Using STAT PLOT to
Make Scatter Plots
Enter new data in
appropriate lists.
• L1 Hours Spent
Studying:
2, 1, ½, 4, 0, 3
• L2 Score on Test:
87, 82, 90, 97, 64,
89
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Using STAT PLOT to
Make Scatter Plots
• Display menu by
pressing 2nd and
PLOT
• Turn on Plot 1
(highlight Plot 1,
Enter, highlight ON
on new screen).
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Using STAT PLOT to
Make Scatter Plots
• Choose type of graph
(must be a reasonable
choice for type of data
listed).
• Choose type of mark
• Press ZOOM 9 (ZoomStat)
• Graph
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Conversion Tool
• Enter a measurement.
• Press 2nd CONVERT
• Choose the type of
measurement you are
converting (length, etc)
• Select your beginning
measurement.
• Select your target
measurement.
• Press ENTER
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Fractions and
Decimals
• To enter a fraction, press
b/c
• Type the numerator, then
press q
• Type the denominator,
then press
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Fractions and
Decimals
• Use the
key to
convert a mixed number
to an improper fraction,
or vice versa.
• Use the
key to convert
a fraction to a decimal, or
vice versa.
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Families of Functions
Use the equation y = ax + k
Problem 1: Varying a
• Group selects one value for k for all
equations in Problem 1.
• Each person in group selects a
different value for a.
• Each person graphs lines on
calculator and then on grid
worksheet.
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Families of Functions
Use the equation y = ax + k
Problem 2: Varying k
• Group selects one value for a for all
equations in Problem 2.
• Each person in group selects a
different value for k.
• Each person graphs lines on
calculator and then on grid
worksheet.
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Families of Functions
Use the equation y = ax + k
• Each group will make two planes on
graph poster paper.
• The group’s lines from Problem #1 will
be graphed on the first plane.
• The group’s lines from Problem #2 will
be graphed on the second plane.
• Write the group’s observation about each
problem and hang the poster on the wall.
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