Texas Instruments TI-73 Explorer Quick start guide

1/30/02 © 2002 Texas Instruments
TI-73 / TI-83 Plus
Math by Hand
How To…
Start and Quit the Application
Use On-screen Options and Menus
Use Step-by-Step Mode
Use Fast Math Mode
Use Missing Pieces Mode
Delete the Application
More Information
Error Recovery
TI

TI-73 / TI-83 Plus Math by Hand Application 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
any applicable purchase price of this item or material. Moreover,
Texas Instruments shall not be liable for any claim of any kind
whatsoever against the use of these materials by any other
party.
Graphing product applications (Apps) are licensed. See the
terms of the license agreement for this product.
Microsoft, Windows, Windows NT, Apple, and Mac are
trademarks their respective owners.

TI-73 / TI-83 Plus Math by Hand Application Page 3
What Is the Math by Hand Application?
The Math by Hand application familiarizes you with mathematical
algorithms for addition, subtraction, multiplication, and division. For each
of these, three different modes are available:
•Step-By-Step mode shows the problem worked out one step at a
time, emphasizing place value in the base-ten system for each
algorithm.
•Fast Math mode shows the problem worked out in an animated
sequence that is similar to how you would solve the problem on
paper.
•Missing Pieces mode is a quiz that presents solved problems with
blank place values. You supply these place values to complete the
algorithm.
The Math by Hand application is a concept application that TI wants to
share with our customers, educators, and students before the product
definition and testing are complete. It is an alpha software version, and as
such, it may contain imperfections, or the coding may be incomplete.
TI invites your feedback concerning the functionality and educational
value of the Math by Hand application. Please send your comments and
questions to [email protected]i.com.

TI-73 / TI-83 Plus Math by Hand Application Page 4
What You Need
Note
In this guidebook, any information that pertains to the TI-83 Plus also
pertains to the TI-83 Plus Silver Edition, unless otherwise noted.
Hardware and software
Notes
TI-73 with version 1.60 or higher of the
Graph Explorer software
—or—
TI-83 Plus or TI-83 Plus Silver Edition
with version 1.14 or higher of the
operating system software
You can download a free copy of the
latest Graph Explorer or operating
system software from
education.ti.com/softwareupdates.
Follow the link to Operating Systems.
Computer with Microsoft ® Windows®
95/98/2000, Windows NT®, or Apple®
Mac® OS 7.1 or higher installed
TI-GRAPH LINK™ computer-to-device
cable
If you do not have this cable, call your
distributor, or order the cable from
TI’s online store.
TI-GRAPH LINK software that is
compatible with the TI-73 or the
TI-83 Plus
—or—
TI™ Connect software, which works with
all supported models of Flash-based TI
graphing devices.
You can download free copies of
TI-GRAPH LINK and TI Connect
software from
education.ti.com/softwareupdates.
Follow the link to Connectivity
Software.

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Where to Find Installation Instructions
Detailed instructions on installing this and other applications are
available at education.ti.com/guides. Follow the link to Flash
installation instructions.
Getting Help
The instructions in this guidebook are only for this application. If
you need help using the TI-73 or TI-83 Plus, refer to its
comprehensive guidebook at education.ti.com/guides.

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Starting and Quitting the Application
Starting the Application
1. Press
nto display the list of applications on your TI73 or
TI83 Plus.
2. Select
MathHand. The application’s information screen is
displayed.
3. Press any key to continue. The developers’ screen is
displayed.
4. Press any key to continue. The SELECT AN OPERATION menu
is displayed.
Quitting the Application
From the SELECT AN OPERATION menu, select QUIT or press
\.

TI-73 / TI-83 Plus Math by Hand Application Page 7
RSTUV
RSTUV
RSTUV
Navigating
Selecting Menu Items
You can select menu items in the following ways.
•Press hor `to highlight the menu item, and then press
¯to select it.
•Press the number key that corresponds to the menu item.
Using On-Screen Options
Each screen displays one or more options along the bottom of
the screen. To select an option, press the graphing key directly
below the option.
For example,
press Tor
Uto select
START.

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Using Step-by-Step Mode
The Step-by-Step mode shows an explanation of each step that
you take to solve a problem. This mode emphasizes the base-ten
system to help develop the fast algorithm for an operation. Each
place value is shown separately with details; zeros that are
usually left off for efficiency are shown, and carrying numbers to
the next higher place value is handled in a developmental form.
1. Select an operation from the SELECT AN OPERATION menu.
2. Select
STEP-BY-STEP from the SELECT A MODE screen.
3. Enter the first element of the problem, and then press ¯
or the appropriate operation key (¥, , , or ).
4. Enter the second element of the problem, and then press
¯.
Tip
If you make a mistake when you enter a number, you can correct
it in one of the following ways.
•Press sto delete the entire number.
•Press _to move the cursor to the incorrect number, and then
enter the correct number.
•Press ^to delete the digit at the cursor location.
5. Select
START to display the first step in solving the problem.

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6. Select
NEXT STEP to display subsequent steps until the
problem is solved.
7. Select
REPEAT to erase the solution so that you can step
through it again.
—or—
Select BACK to return to the SELECT A MODE menu.
—or—
Select NEW to enter a new problem for the same operation.

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The examples below show the algorithms used to solve
problems for each type of operation.
Addition
Example: 34 + 27 = ?
First, the values in the ones place are added, and the
partial sum is shown: 11 =4+7.
Note: Instead of showing the carrying of the 1 to the
tens place above the 3, the partial sum of the values
in the ones place, 11, is shown. This helps students
who are learning the algorithm for the first time or
those who have trouble lining up their writing.
Next, the values in the tens place are added and the
partial sum is shown: 50 =30 +20.
In the final step, the partial sums are added and the
answer is shown: 11 +50 =61.

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Subtraction
Example: 56 129 =?
First, the value 56 is regrouped into 4 tens and16
ones. Now, 9 can be subtracted from 16, leaving 7 in
the ones column.
Next, 2 tens are subtracted from 4 tens to arrive at the
final answer of 27.

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Multiplication
Example: 12 423 =?
The application applies the distributive property to
multiplication problems and displays the solution in a
vertical format.
You could also apply the distributive property and
display the solution in a horizontal format, as shown
below.
(
)
(
)
3
20
2
10
23
12
+
×
+
=
×
(
)
(
)
(
)
(
)
3
2
20
2
3
10
20
10
×
+
×
+
×
+
×
=
6
40
30
200
+
+
+
=
276
=

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Division
The application shows that there are 10 groups of 22
in 438, not 1 group of 22 in 43. This helps students
who are learning the algorithm for the first time, or who
have trouble lining up their writing.
The next step shows that there are 9 groups of 22 in
218. Since the remainder is less than the divisor, the
problem is solved.
To see the answer in fraction form, select FRAC. If the
fraction can be simplified, the simplified value is also
shown.

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Using Fast Math Mode
The Fast Math mode shows the problem worked out in an
animated sequence without showing the details that the
Step-by-Step mode shows.
1. Select an operation from the SELECT AN OPERATION screen.
2. Select
FAST MATH from the SELECT A MODE screen.
3. Enter the first element of the problem, and then press ¯
or the appropriate operator (¥, , , or ).
4. Enter the second element of the problem, and then press
¯.
Tip
If you make a mistake when you enter a number, you can correct
it in one of the following ways.
•Press sto delete the entire number.
•Press _to move the cursor to the incorrect number, and then
enter the correct number.
•Press ^to delete the number at the cursor location.
5. Select
START to solve the problem.
Tip
Select
FASTER to display the solution more quickly.

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The examples below show the standard fast algorithm.
Addition
No partial sums are shown in the standard algorithm.
Notice that the 1 is carried to the tens place above the 3.
Subtraction
Subtraction in Fast Math mode is similar to subtraction
in Step-by-Step mode. No text is displayed on the
screen to explain the steps.

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Multiplication
Multiplication in Fast Math mode shows the shortcuts
that students can use with this algorithm.
Notice that 3 412 and 20 412 are displayed as partial
products, which is a compression of the steps shown
in Step-by-Step mode.

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Division
Division in Fast Math mode shows the shortcuts that
students can use with this algorithm.
To see the answer in fraction form, select FRAC. If the
fraction can be simplified, the simplified value is also
shown.

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Using Missing Pieces Mode
Missing Pieces mode is a quiz that challenges you to fill in the
missing place values in a problem. Keep in mind the following
rules as you play the game.
•Use _and ato move the cursor to the next missing place
value.
•Enter the missing values, and then press ¯to check your
answer.
•After you check your answer, press ¯to display a new
problem.
•A leading zero is never a correct answer for a missing place
value. For example, if the problem shows Ù9, the missing
number can be 1 – 9. If the problem shows 1Ù9, the missing
number can be 0 – 9.
•In division problems, the remainder must be less than the
divisor.
•In division problems, the divisor cannot be 0.
•There may be more than one correct answer. The TI83 Plus
checks your answer to verify that it is correct.

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You score points based on the difficulty of the problem and how
quickly you fill in the missing pieces.
Tip
•When your score exceeds a multiple of 10,000, the score
counter is restarted. When the game ends, the cumulative
score is displayed.
•The maximum score that is displayed is 50,000. You can
continue playing after your score exceeds 50,000, but the score
will not change.
At the beginning of the game, you have three lives (lives are the
number of opportunities you have to continue playing the game if
you give an incorrect answer). You can earn extra lives by
scoring points. When your score first exceeds 500 points, you
earn one extra life; after that, you earn an extra life each time
you score 2000 more points.
Tip
The game displays a maximum of three lives, but you can earn
additional lives.

TI-73 / TI-83 Plus Math by Hand Application Page 20
Number of lives
remaining (dots)
and your current
score
Amount of time
remaining to solve
this problem
Animated
hourglass
Press ato move the
cursor to this missing
place value.
Missing place value
at the current cursor
location
Returns to the
SELECT A MODE
menu.
Displays a hint to
solve the problem.
Press any key to
return to the game.
Displays the game
instructions. Press
any key to return
to the game.