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.
ƒ
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.
n
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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
D
n
d
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
?
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)
‹‡$
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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
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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 z® 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)
− T U V W ® ! " # $
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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
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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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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
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Texas Instruments
7800 Banner Dr.
Dallas, TX 75251 U.S.A.
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Texas Instruments Holland B.V.
Rutherfordweg 102
3542 CG Utrecht - The Netherlands
US 15àRGà1L1àA
Page 5
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