Texas Instruments TI - 40 - Manual

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TI

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Scientific Calculator

Texas Instruments
7800 Banner Dr.
Dallas, TX 75251 U.S.A.

Texas Instruments Holland B.V.
Rutherfordweg 102
3542 CG Utrecht - The Netherlands

¾

www.ti.com/calc



1999 Texas Instruments Incorporated

General Information

Examples: See the last page of these instructions for
keystroke examples that demonstrate many of the
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functions. Examples assume all default

settings.

&

turns on the TI

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.

%

'

turns it off and

clears the display. APD™ (Automatic Power Down™) turns
off the TI

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automatically if no key is pressed

for about 5 minutes. Press

&

after APD. The display,

pending operations, settings, and memory are retained.

2-Line Display: The first line (Entry Line) displays an entry
of up to 88 digits (or 47 digits for Stat or Constant Entry
Line). Entries begin on the left; those with more than 11
digits scroll to the right. Press

!

and

"

to scroll the line.

Press

%

!

or

%

"

to move the cursor immediately to

the beginning or end of the entry.

The second line (Result Line) displays a result of up to 10
digits, plus a decimal point, a negative sign, a “x10” indicator,
and a 2-digit positive or negative exponent. Results that
exceed the digit limit are displayed in Scientific Notation.

Indicator

Definition

2nd

2nd function.

FIX

Fixed-decimal setting.

STAT

Statistical mode.

RAD

Angle mode set to radians.

ÄÄ

Q

ÄÄ

ÄÄ

R

ÄÄ

Displays quotient (

Q

) and remainder (

R

) for

integer divide result.

N/D

¹

n/d

The fraction result can be further simplified.

º

»

An entry is stored in memory before and/or
after the active screen. Press

#

and

$

to

scroll.

¹

¸

An entry or menu displays beyond 11 digits.
Press

!

or

"

to scroll.

2nd Functions:

%

displays the 2nd indicator, and then

selects the 2nd function (printed above keys) of the next key
pressed. For example,

%

b

25

E

<

calculates the

square root of 25 and returns the result, 5.

Menus: Certain TI

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keys display menus:

z

,

%

h

,

L

,

d

,

%

~

,

%

A

,

%

B

,

%

t

,

u

,

%

w

,

H

,

%

I

,

=

,

%

k

,

%

‚

,

and

%



.

Press

!

or

"

to move the cursor and underline a menu

item. To return to the previous screen without selecting the
item, press

-

. To select a menu item:

¦

Press

<

while the item is underlined, or

¦

For menu items followed by an argument value, enter the
argument value while the item is underlined. The item and
the argument value are displayed on the previous screen.

Previous Entries

#

$

After an expression is evaluated, use

#

and

$

to scroll

through previous entries, which are stored in the
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memory. You cannot retrieve previous

entries while in

STAT

mode.

Last Answer

%

i

The most recently calculated result is stored to the variable
Ans. Ans is retained in memory, even after the
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is turned off. To recall the value of Ans:

¦

Press

%

i

(Ans displays on the screen), or

¦

Press any operations key (

T

,

U

,

F

, etc.) as the first

part of an entry. Ans and the operator are both displayed.

Order of Operations

The TI

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uses EOS

é

(Equation Operating

System) to evaluate expressions.

1st

Expressions inside parentheses.

2nd

Functions which need a ) and precede the argument,
such as the sin, log, and all R

Í

P menu items.

3rd

Fractions.

4th

Functions that are entered after the argument, such
as x

2

and angle unit modifiers (

Ä

Å

Æ

r

g

).

5th

Exponentiation (^) and roots (x

Ñ

).

6th

Negation (

M

).

7th

Permutations (nPr) and combinations (nCr).

8th

Multiplication, implied multiplication, division.

9th

Addition and subtraction.

10th Conversions (Ab

Ì

c

Í

d

Ì

e,

4

F,

4

D,

4

%,

4

DMS).

11th

<

completes all operations and closes all open

parentheses.

Clearing and Correcting

-

Clears an error message.
Clears characters on the entry line.
Moves the cursor to last entry in history
once display is clear.

J

Deletes the character at the cursor.
Deletes all characters to the right when
you hold down

J

; then, deletes 1

character to the left of the cursor each time
you press

J

.

%

f

Inserts a character at the cursor.

%

{

Clears all memory variables.

%

t

CLRDATA

Clears all data points without exiting

STAT

mode.

%

w

Y

Clears all data points and exits

STAT

mode.

%



Y

or

&

&

-

Resets the TI

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. Returns unit

to default settings; clears memory
variables, pending operations, all entries in
history, and statistical data; clears
constant mode and

Ans

.

Math Operations

d

d

displays a menu with various math functions. Some

functions require you to enter 2 values, real numbers or
expressions which equal return a real number.

%

`

separates 2 values.

abs(#)

Displays absolute value of

#

.

round(#,digits) Rounds

#

to specified number of digits.

iPart(#)

Returns only the integer part (iPart) or