Arithmetic | +, -, x,![]() |
4 |
Data entry | +/-, ![]() |
2 |
Display | Scientific Notation Exponent Increment Exponent Decrement |
3 |
Algebraic | x2, ![]() ![]() |
5 |
Clearing | Clear and Clear Entry | 2 |
Data grouping | lOpen and close parentheses 3 (up to 15) and full algebraic hierarchy (up to 4 pending operations) | 3 |
Memory | Store, Recall, Sum, Exchange | 4 |
Percent | %, +%, -%, x%, :% | 5 |
Trigonometric | Sin, Cos, Tan, Sin-1, Cos-1, Tan-1, and 3 angular modes (Degrees, Radians, Grads) | 9 |
Logarithmic | ln x, log, ex, 10x | 4 |
Constant | Operates with +, -, x, ¸, yx
and ![]() |
6 |
47 |
![]() |
On/clear Key - This key applies power to the calculator and allows input error correction (see chapter Input Error Correction). |
![]() |
Off Key - Removes power from the calculator. |
![]() ![]() |
Digit Keys - Enter numbers 0 through 9. See chapter Data entry. |
![]() |
Decimal Point Key - Enters a decimaL point. See chapter Data entry. |
![]() |
Change sign Key - Changes the sign of the mantissa and/or of the exponent. |
![]() |
Pi Key - Enters the value of pi correct to 11 digits. (This value is rounded to 8 digits for display only). |
![]() |
Add Key* - Instructs the calculator to add the next entered quantity to the displayed number. See chapter Arithmetic Functions. |
![]() |
Subtract Key* - Instructs the calculator to subtract the next entered quantity from the displayed number. See chapter Arithmetic Functions. |
![]() |
Multiply Key* - Instructs the calculator to multiply the displayed numbers by the next entered quantity. See chapter Arithmetic Functions. |
![]() |
Divide Key* - Instructs the calculator to divide the displayed number by the next entered quantity. See chapter Arithmetic Functions. |
![]() |
Equals Key - Completes all previously entered numbers and operations. This key is used to obtain both intermediate and final results. See chapter Arithmetic Functions. |
![]() |
Constant Key - Stores a number and its associated operation for repetitive calculations. See chapter Calculations with a constant. |
![]() ![]() |
Parentheses Keys - Used to isolate particular numerical expressions for correct mathematical interpretation. See chapter Parentheses. |
![]() |
y to x Power Key - Raises the displayed value y to the xth power. See chapter Roots and Powers. |
![]() |
Square Key - Calculates the square of the number in the display. See chapter Roots and Powers. |
![]() |
Square Root Key - Calculates the square root of the number in the display. See chapter Roots and Powers. |
![]() |
Reciprocal Key - Divides the display value into 1. See chapter Reciprocal. |
![]() |
Percent Key - Converts displayed number from a percentage to a decimal. See chapter Percent. |
![]() |
Natural logarithm - Calculates the natural logarithm (base e) of the number in the display. See chapter Natural logarithm. |
![]() |
Common Logarithm - Calculates the common logarithm (base 10) of the number in the display. See chapter Common logarithm. |
![]() |
Degree, Radian, Grad Key - Selects the units for angular measurement. Can be changed whenever desired. See chapter Degree, Radian, Grad Conversions. |
![]() |
Sine Key - Instructs the calculator to find the Sine of the displayed angle. See chapter Trigonometric functions. |
![]() |
Cosine Key - Instructs the calculator to find the cosine of the displayed angle. See chapter Trigonometric functions. |
![]() |
Tangent Key - Instructs the calculator to find the tangent of the displayed angle. See chapter Trigonometric functions. |
![]() |
Exponent Entry and Exponent/Decimal Shift Key - Allows entering and shifting down of the exponent. (Decrement). See chapters Scientific Notation and Exponential Shift. |
![]() |
Store Key - Stores the displayed quantity in the memory. See chapter Memory Usage. |
![]() |
Recall Key - Retrieves stored data from the memory to the display. See chapter Memory Usage. |
![]() |
Sum to Memory Key - Algebraically adds the displayed value to the memory content.. See chapter Memory Usage. |
![]() |
Exchange Key - Exchanges the content of the memory with the displayed value. See chapter Memory Usage. |
![]() |
Iniverse Key - When pressed before yx, ln x, log,
sin, cos, tan and ![]() ![]() |
* NOTE : Pressing one of these keys completes any previously entered
divide or multiply, yx- or -function.
Any negative number displays a minus sign immediately to the left of the mantissa.
Numbers up to 8 digits in length can be entered into the calculator directly from the keyboard. The calculator can hold and work with 11 digits. Numbers of this length can be entered as the sum of two numbers.
Example : Enter 389182.70636
Enter | Press | Display |
---|---|---|
389182 | ![]() |
389182 |
.70636 | ![]() |
389182.17 |
If an incorrect number entry is made, pressing the key before any non-number key clears the incorrect number without affecting any calculation in progress.
Correction of an incorrect operation entry while there are incomplete
operations in the calculator is dependent on the table below.
Inorrect Entry | Desired Entry | |||
---|---|---|---|---|
+, - | x, ![]() |
yx | ![]() |
|
+, - | CT | ON/C | ON/C | ON/C |
x, ![]() |
CT | CT | ON/C | ON/C |
yx | CT | CT | - | ON/C |
![]() |
CT | CT | CT | - |
CK means to press the correct key and continue.
The
key
in the table indicates that the incorrect entry cannot safely be
corrected to the desired operation for all conditions so the problem
must be restarted.
The entry procedure is to key in the mantissa (including its sign),
then press and enter the power of ten.
The last two digits on the right side of the display are used to
indicate the exponent of 10. Additional digits can be entered after
pressing but only the last two numbers pressed are retained as
the exponent
Regardless of how a mantissa is entered in scientific notation, the calculator normalizes the number, displaying a single digit to the left of the decimal point, when any function or operation key is pressed.
Example : Enter 6025 x 1020
.
Enter | Press | Display |
---|---|---|
![]() |
0 | |
6025 | ![]() |
6025. 00 |
20 | 6025. 20 | |
![]() |
6.025 23 |
The decimal point of the entered mantissa must not be beyond the 5th
digit from the left because the mantissa for scientific notation is
limited to 5 digits in the display. Eight digits can be entered, but
only 5 are displayed when is pressed. The entire eight
digit mantissa is used for calculations. It is possible to convert
numbers of more than 5 digits on the condition to follow the
instructions given under paragraph Notes on
Calculator Operation.
Data in scientific notation form may be entered intermixed with data in standard form. The calculator converts the entered data for proper calculation.
Example: 3.2 x 103 +
12575.321 = 15775.321
Enter | Press | Display |
---|---|---|
![]() |
0 | |
3.2 | ![]() |
3.2 00 |
3 | ![]() |
3.2 03 |
12575.321 | ![]() ![]() |
1.5775 04 |
1 | ![]() ![]() ![]() |
15775.321 |
This example shows how the display can be removed from scientific
notation format. If the displayed number is less than ± 9.9999 x 107 and larger than
± 1 x 107,
pressing
then an operation after a number entry
will produce a
result in normal display format. Once a number is entered in scientific
notation, the calculator will remain in scientific notation format
until
is
pressed or the above procedure performed.
Example 1.2 x 1016 +
3.45 x 1014 = 1.2345 x 1016 =
12.346 x 1015 = 1.2345 x 1016
Enter | Press | Display |
---|---|---|
1.2 | ![]() |
1.2 00 |
16 | ![]() |
1.2 16 |
3.45 | ![]() |
3.45 00 |
14 | ![]() |
1.2345 16 |
![]() |
12.345 15 | |
![]() ![]() |
1.2345 16 |
It is a safe procedure to press the key before the start of each
new problem, unless
has been used to obtain the final result
of
a previous problem.
Algebraic rules state that multiplication is to be performed before addition. So, algebraically, the correct answer is (5 x 4) + (3 x 2) = 26. The complete list of priorities for interpreting expressions is:
Example: 4 :
52x 7 + 3 x sin 30cos 60° =
3.2413203
Enter | Press | Display | Comments |
---|---|---|---|
4 | ![]() |
4. | (4:) is stored. |
5 | ![]() |
25 | (52) - special function x2 evaluated immediately. |
![]() |
0.16 | (4:52) evaluated because x is same priority as ¸. | |
7 | ![]() |
1.12 | x higher priority than +, so (4 : 52 x 7) evaluated. und + stored. |
3 | ![]() |
3. | (3x) stored. |
30 | ![]() ![]() |
0.5 | Sin 30° evaluated immediately yx stored. |
60 | ![]() |
0.5 | Cos 60° evaluated immediately. |
![]() |
3.2413203 | Completes all operations: sin 30cos 60° evaluated, then 3 x sin 30cos 60°next, then this is added to 1.12. |
Thus, by entering the expression just as it is written, the calculator correctly interprets it as (4 : 52) x 7 + (3 x sin 30cos 60°). This enables to perform sum of products directly on the keyboard. When you have a special case where this hierarchy of interpretation does not give you the results you require, parentheses are available to clarify the mathematical expression for the calculator.
To illustrate the benefit of parentheses, try the following
experiment: press
and you will see the
value 35 displayed. The
calculator has evaluted 5 x 7 and
replaced it with 35 even though the
key was not pressed
Because of this function of parentheses, the algebraic rules now apply
their hierarchy of operations to each set of parentheses. Use of
parentheses insure that your problem can be keyed in just as you have
written it down. The calculator remembers each operation and evaluates
each part of the expression as soon as all necessary information is
available. When a closed parenthesis is encountered, all operations
back to the corresponding open parenthesis are completed.
Example : 4 x (5 + 9) (7 - 4)(2+3) =
.23045268
Key in this expression and follow the path to completion.
Enter | Press | Display | Comments |
---|---|---|---|
4 | ![]() ![]() |
4. | (4x) stored pending evaluation of parentheses |
5 | ![]() |
5. | (5+) stored |
9 | ![]() |
14. | (5 + 9) evaluated |
![]() |
56. | Hierarchy evaluates 4 x 14. | |
![]() |
56. | (56:) stored pending evaluation of parentheses | |
7 | ![]() |
7. | (7-) stored |
4 | ![]() |
3. | (7-4) evaluated |
![]() ![]() |
3. | Prepares for exponent | |
2 | ![]() |
2. | |
3 | ![]() |
5. | (2 + 3) evaluated |
![]() |
.23045268 | (7-4)(2+3) evaluated 4 x (5 + 9) |
As many as fifteen parentheses can be open at any one time and four operations can be pending. If you do attempt to open more than 15 parentheses or if the calculator tries to store more than four operations, the error message appears in the display.
Each time a closed parenthesis is encountered, the contents are evaluated back to the nearest open parenthesis and are replaced with a single value. Specifically, you can check intermediate results. Note that in all the examples, the expressions are entered in a straight left to right sequence.
m | ![]() |
![]() |
adds m to each subsequent entry. |
m | ![]() |
![]() |
subtracts m from each subsequent entry. |
m | ![]() |
![]() |
multiplies each subsequent entry by m. |
m | ![]() |
![]() |
divides each subsequent entry by m. |
m | ![]() |
![]() |
raises each subsequent entry to the m power. |
m | ![]() ![]() |
![]() |
takes the mth root of each subsequent entry. |
After storing the constant, each calculation is completed by entering
the new number and pressing . Clearing the calculator or
entering any of the above arithmetic functions eliminates the constant
that is currently stored.
The higher mathematical functions use iterative calculations. The cumulative error from these calculations in most cases is maintained beyond the eight-digit display so that no inaccuracy is displayed.
Most calculations are accurate to ±2 in the eighth digit as long as the calculator is not in scientific notation. The only exceptions are the tangent function as it approaches undefined limits and yx where y is within 10-6 of 1.
Universal powers are accessed by the key and roots are
accessed by
key sequence providing
.
These functions are the only special functions that do not act on the
displayed value immediately. They require a second value before the
function can be realized. Enter y, press or
,
enter x and press
or an arithmetic function key to yield the
answer.
There is a restriction on these functions - the variable y must be non-negative. When y is negative "Error" lights up on the display after x and an operation key is pressed. Any non-negative number taken to the zero power is 1.
When is pressed after an arithmetic operation, add on,
discount and percentage can be computed as follows:
n
: adds n % to the
number
displayed
n
: subtracts n %
from the number
displayed
n
: multiplies by n %
the number
displayed
n
: devides by n %
the number
displayed
Arc Function | Quadrant |
---|---|
arcsin x, arccos x, arctan x | First |
arcsin -x, arctan -x | Fourth |
arccos -x | Second |
Conversion | Key Sequence |
---|---|
Degrees to Radians Radians to Grads Grads to Degrees |
![]() ![]() ![]() ![]() |
Degrees to Grads Grads to Radians Radians to Degrees |
![]() ![]() ![]() ![]() ![]() |
The angular range of the above conversions must be limited to the first
and fourth quadrants. Larger angles are returned in those quadrants.
Hyperbolic Sine (sinh) x = | 1/2 (ex-e-x) | = | e2x - 1 2ex |
Hyperbolic Cosine (cosh) x = | 1/2 (ex+e-x) | = | e2x + 1 2ex |
Hyperbolic Tangent (tanh) x = | ex - e-x ex + e-x |
= | e2x - 1 e2x + 1 |
cosh-1x = ln(x +Ö(x2
- 1))
tanh-1x = 1/2 ln | 1 + x 1 - x |
The Store key stores the displayed quantity in the
memory
without removing it from the display. Any previously stored value is
cleared.
The Recall key retrieves stored data from the memory to
the display. Use of this key does not clear the memory.
The Sum to Memory key algebraically adds the
displayed value to the memory contents.
Important: The clear key does not clear the memory except when the
calculator is first turned on. Therefore the first quantity should be
stored using
, or a zero should be stored to ensure the
memory is empty before using
.
This key is used to accumulate the results from a series of independant
calculations. replaces the arithmetic sequence
.
The exchange key swaps the content f the memory with the
displayed value. The displayed value is stored and the previously
stored value is displayed.
This key combines the store and recall operations into a single key.
Use of this key, like the other memory keys, does not disturb a
sequence of calculations and can consequently be used anywhere in the
solution of a problem.
2. Attempting to use a number greater than 1 x 1099 as the first operand in multiplication may result in "Error" condition although the product is within the capacity of the calculator.
Example: 2 99
.6
"Error".
The problem may be solved in the reversed order,
Example: .6 2
99
1.2 99 (=1.2 x 1099).
3. Any entry in scientific notation with a negative zero exponent can
cause erroneous results.
Example : 2
2
4 - 04
2. If the display contains only a decimal point moving across
the window, the calculator has automatically lapsed into a power saving
mode. The value that was present in the display can be easily retrieved
and displayed by pressing the exchange key twice. This
procedure does not adversely affect any calculation in progress.
3. If the display fails to light, check for an improperly inserted or dischanged battery pack. Also try to unplug and reinsert the battery connector. See chapter Battery considerations.
4. When a battery pack is inserted into the calculator and the display
is not blank, pressing should blank the display and
prepare the calculator for your use.
5. Review operating instructions to be certain calculations are performed correctly.
This warranty is void if: the calculator has been damaged by accident or unreasonable use, neglect, improper service or other causes not arising out of defects in material or workmanship.
TEXAS INSTRUMENTS SHALL NOT BE LIABLE FOR LOSS OF USE OF THE CALCULATOR OR OTHER INCIDENTAL OR CONSEQUENTIAL COSTS, EXPENSES OR DAMAGES INCURRED BY THE PURCHASER.
During the above one-year period, the calculator or its defective parts will be repaired, adjusted and/or replaced with a reconditioned model of equivalent quality ("REFURBISHED") at manufacturer's option without charge to the purchaser when the calculator is returned, prepaid and insured, with proof-of-purchase date, to Texas Instruments. UNITS RETURNED WITHOUT PROOF-OF-PURCHASE DATE WILL BE REPAIRED AT THE SERVICE RATES IN EFFECT AT THE TIME OF RETURN.
In the event of replacement with a reconditioned model, the replacement unit will continue the warranty of the original calculator product or 90 days whichever is longer.
THIS WARRANTY OFFERS YOU SPECIFIC LEGAL RIGHTS AND DOES NOT AFFECT ANY STATUTORY CONSUMER RIGHTS.
IMPORTANT: Before returning your calculator for repair,
carefully review service and mailing instructions in this manual.