Texas Instruments TI 15 User Manual

Display Indicators  
Integer Division  
£
When you divide a positive whole number by a positive  
whole number with £, the result is displayed in the form  
Q r R, where Q is the quotient and R is the remainder.  
Indicator Definition  
Calculator is in Problem Solving mode.  
TIN15  
Calculator is in Place Value mode.  
Calculator is rounding results.  
z has been pressed.  
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If you use the result of integer division in a subsequent  
calculation, the TI-15 uses only the quotient; the remainder  
is dropped.  
Fix  
Calculator and Arithmetic Trainer  
4M  
Copyright ã 1999 Texas Instruments Incorporated  
A value other than zero is in memory.  
Stored operation function is active.  
M
Fractions ž ¥  ¢ ¦ ¤ §  
Ÿ
Op1, Op2  
Auto  
General Information  
In calculator mode, Auto simplification of  
fractions is active. In , Problem Solving  
function is in Auto mode.  
The TI-15 has two power sources-battery and solar. It  
operates in well-lit areas using solar cell, and it operates in  
other light settings on battery.  
Press ž after entering a number to designate the  
numerator of a fraction.  
I
Integer division function is active (appears  
only when cursor is over the division sign).  
Press ¥ after entering a number to designate the  
denominator of a fraction.  
Examples: See the Examples page for representative  
problems and keystroke sequences that demonstrate many  
of the TI-15’s functions and capabilities. Before starting  
each problem set, reset the calculator by pressing and  
simultaneously to help ensure that your displays are  
the same as those shown in the examples. In Problem  
Solving Auto mode, however, displays will vary from those  
shown, because these problems are random.  
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Results of division will be displayed in  
fraction format.  
Both numerator and denominator must be integers. If you  
enter a denominator greater than 1000, or if a calculation  
yields a denominator greater than 1000, the TI-15 displays  
results in decimal format.  
N
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The fractional result can be simplified.  
"
More entry history or menus are available.  
Press # or $ to access.  
º »  
You can input either the numerator or the denominator first.  
 separates the whole number from the fraction in a  
mixed number.  
An entry or menu extends beyond the  
capacity of the screen. Press ! or " to  
scroll.  
! "  
Basic Operations  
¢ displays a menu that lets you specify how fraction  
results are displayed.  
To turn the TI-15 on, press .  
If the calculator is on, press to turn it off.  
APD™ (Automatic Power Down™) turns off the TI-15  
automatically if no key is pressed for about 5 minutes.  
Press after APD to power up again; the display,  
pending operations, settings, and memory are retained.  
¦U n/d (default) displays results as mixed numbers.  
Mode Setting Menus  
‡ ¢ ‹ Œ  
¦n/d displays results as simple (improper) fractions.  
Key  
Menu Choices Displayed  
¢$ displays a menu that lets you specify the  
simplification method.  
.
n/d (Decimal or fraction display)  
¦Man (default) requires manual simplification of fractions.  
+1  
OP1  
N
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OP2  
(Show or hide in Op)  
(Clear stored Op)  
(Select or reject Reset)  
‡$  
‡$$  
‡$$$  
¢
¦Auto automatically reduces fraction results to lowest  
terms.  
Display and Scrolling  
" ! # $  
Y
N/D"n/d indicates that fraction results can be simplified.  
U n/d n/d (Select format of fractions)  
Man Auto (Simplification procedure)  
Auto Man (Automatic or Manual)  
The TI-15 has a two-line display; each line has room for 11  
characters. Entries that do not fit on the first line wrap to  
the second, and then scroll when the second line is filled.  
Exception: When computing fractions, the TI-15 displays  
only one line, which scrolls when a problem exceeds the  
capacity of the line.  
¢$  
¤ enables you to simplify a fraction manually.  
‹‡  
§ displays the factor that was used to simplify a fraction  
in your last manual simplification step. Press § again to  
restore the fraction to the screen.  
1
+
11-.  
2
-
3
(Level of difficulty)  
(Type of operation)  
(Place Value function)  
‹‡$  
Q
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-1-  
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‹‡$$  
‹‡"®$  
¦ converts a mixed number to an improper fraction or  
an improper fraction to a mixed number.  
Entries can be up to 88 characters. Exceptions: In Stored  
Operations, the limit is 44 characters. In Man mode,  
entries do not wrap; entries cannot exceed 11 characters.  
Press ! or " to underline a menu item. To select the  
underlined item, press ®. To exit, press .  
Ÿ converts a fraction to a decimal, or converts a  
decimal to a fraction, if possible.  
When a result exceeds the capacity of the screen, it is  
displayed in scientific notation. However, if the result is  
greater than 10^99 or less than 10^L99, you will get an  
overflow error or underflow error, respectively.  
If a problem contains both fractions and decimals, the  
results are displayed in decimal format. However, if you  
press and select n/d, the results of division will be  
displayed in fraction format, when possible.  
Order of Operations  
The TI-15 uses the Equation Operating System (EOSé) to  
evaluate expressions.  
Scroll with ", !, #, and $.  
1st Expressions inside parentheses.  
2nd Functions that need a ) and precede the argument.  
3rd Fractions.  
¦Press " and ! to scroll through entries or to move the  
Percents  
ª y  
underscore within a menu list.  
¦Press # and $ to scroll through history or, within a  
menu, to move to the next level of menu lists.  
Press ª after a entering a value to calculate a percent.  
4th Exponentiation (^) and roots ().  
5th Negation (L).  
Press y to convert a decimal or a fraction to a percent.  
Clearing, Correcting and Resetting  
w  
Roots and Powers  
¨ ¬  
6th Multiplication, implied multiplication, division.  
7th Addition and subtraction.  
w
Deletes the character to the left of the  
cursor. In fractions, clears from right  
bottom to left top.  
¬ lets you obtain the square root of a number. After  
entering the number, be sure to close the parentheses.  
8th Conversions (U n/d/n/d, F/D, 4%).  
9th ® completes all operations.  
¨ raises a number to the power you specify.  
Clears display and error condition.  
(Does not clear value from memory.)  
Basic Arithmetic  
T U V W r « ®  
Pi  
©
|| Clears value from memory.  
To reset, hold down and ”  
simultaneously for a few seconds and  
release. MEM CLEARED displays.  
This completely clears the calculator  
and restores all default settings. You  
can also reset using the Mode menu  
(see below).  
© enters the value of p, which is stored internally to 13  
digits (3.141592653590). In some cases, results display  
with symbolic p, and in other cases as a numeric value.  
and ”  
q, h, i, j, k, Enters numerals 0 through 9.  
l, m, n, o, p  
T, U, V, W  
r
Adds, subtracts, multiplies, divides.  
Inserts decimal point.  
Memory  
z |  
M
Enters a negative sign. (Does not  
act as an operator.)  
After a calculation, press to store the displayed  
result in memory. If memory already contains a value, the  
new one will replace it. When memory contains a value  
other than 0, M displays on the screen.  
X, Y  
Opens, closes a parenthetical  
expression.  
®
Completes all operations.  
To recall the value from memory for use in a calculation,  
press | once.  
To clear memory, press ||.  
US 15àRGà1L1àA  
Page 1  
TI Product Service and Warranty Information  
(continued)  
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Always contact Texas Instruments Customer Support before  
returning a product for service.  
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Texas Instruments retailer/distributor.  
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Other TI Products and Services  
Visit the TI calculator home page on the World Wide Web.  
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Warranty Information  
Customers in the U.S. and Canada Only  
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One-Year Limited Warranty for Electronic Product  
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This Texas Instruments (“TI”) electronic product warranty extends  
only to the original purchaser and user of the product.  
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Warranty Duration. This TI electronic product is warranted to the  
original purchaser for a period of one (1) year from the original  
purchase date.  
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Warranty Coverage. This TI electronic product is warranted against  
defective materials and construction. THIS WARRANTY IS VOID IF  
THE PRODUCT HAS BEEN DAMAGED BY ACCIDENT OR  
UNREASONABLE USE, NEGLECT, IMPROPER SERVICE, OR  
OTHER CAUSES NOT ARISING OUT OF DEFECTS IN  
MATERIALS OR CONSTRUCTION.  
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Warranty Disclaimers. ANY IMPLIED WARRANTIES ARISING  
OUT OF THIS SALE, INCLUDING BUT NOT LIMITED TO THE  
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS  
FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION  
TO THE ABOVE ONE-YEAR PERIOD. TEXAS INSTRUMENTS  
SHALL NOT BE LIABLE FOR LOSS OF USE OF THE  
PRODUCT OR OTHER INCIDENTAL OR CONSEQUENTIAL  
COSTS, EXPENSES, OR DAMAGES INCURRED BY THE  
CONSUMER OR ANY OTHER USER.  
§¤®  
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Some states/provinces do not allow the exclusion or limitation of  
implied warranties or consequential damages, so the above  
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you may also have other rights that vary from state to state or  
province to province.  
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Warranty Performance. During the above one (1) year warranty  
period, your defective product will be either repaired or replaced with  
a reconditioned model of an equivalent quality (at TI’s option) when  
the product is returned, postage prepaid, to Texas Instruments  
Service Facility. The warranty of the repaired or replacement unit  
will continue for the warranty of the original unit or six (6) months,  
whichever is longer. Other than the postage requirement, no charge  
will be made for such repair and/or replacement. TI strongly  
recommends that you insure the product for value prior to mailing.  
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Software. Software is licensed, not sold. TI and its licensors do not  
warrant that the software will be free from errors or meet your  
specific requirements. All software is provided “AS IS.”  
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Copyright. The software and any documentation supplied with this  
product are protected by copyright.  
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For information about the length and terms of the warranty, refer to  
your package and/or to the warranty statement enclosed with this  
product, or contact your local Texas Instruments retailer/distributor.  
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Copyrightã 1999 Texas Instruments Incorporated  
7V6Ž43®  
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Texas Instruments  
7800 Banner Dr.  
Dallas, TX 75251 U.S.A.  
15W3ŽŽ4  
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Texas Instruments Holland B.V.  
Rutherfordweg 102  
3542 CG Utrecht - The Netherlands  
US 15àRGà1L1àA  
Page 5  

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