Texas instruments TI.25X User Manual
The TI.25X Solar Calculator
Key
Function+ ([ON])
If the calculator is off, turns the unit on,
clears the display, and resets angle units to
degrees.
-
When pressed once during a calculation
(but before an operation key), clears the
displayed entry and any error condition (E).
You can make a new entry and continue
with your calculation.
Pressing - does not clear the memory,
statistics register, or angle-unit setting.
`
Instructs the calculator to perform the
second function (written above the key) of
the next key pressed.
The TI-25X Solar calculator offers you a wide range of
mathematical and statistical capabilities. This manual
explains these capabilities.
Basic Operations
To turn the calculator on, expose the solar panel to
adequate light and press + ([
ON]).
1.ENG
The Display
Indicator
Meaning
The displayed number is negative.
2nd
The ` key has been pressed to access
the second function (written above the key)
of the next key pressed.
D
Angle units are set to degrees.
R
Angle units are set to radians.
G
Angle units are set to grads.
( )
One or more parentheses are open.
STAT
The calculator is in statistics mode. That is,
the statistics register contains data.
K
A number and operation are stored as a
constant.
M
A number other than zero is stored in
memory.
E
An error has occurred. You must press
-
or + to clear the error.
You can enter a maximum of eight digits in the display. Any
digit key pressed after the eighth is ignored.
–
2.ENG
Scientific Notation
Key
Function
a
Example: To enter 1.2345 × 106:
1.2345 a 6 1.2345 06
` \
Removes a displayed result from scientific
notation and displays it in standard decimal
format.
mantissa
exponent
floating mantissa sign
exponent sign
In scientific notation, a number is expressed as a mantissa
multiplied by 10 raised to a power (exponent).
Entering a Number in Scientific Notation
1. Enter the mantissa. If it is negative, press @.
2. Press a. Two zeros appear on the right side of the
display.
3. Enter the exponent (one or two digits). If it is negative,
press @. If you press an incorrect digit key, just
reenter the correct digits.
Converting a Number to Scientific Notation
To convert a displayed number from standard display
format to scientific notation, press n 1 a l.
3.ENG
Correcting Entry Errors
At any point in a calculation, you can press - twice to
clear all calculations, including any errors, and start over.
Clearing an Error Condition
The display shows E when an error, overflow, or underflow
occurs or when you enter an improper operation. No entry
from the keyboard is accepted until you press -, which
clears the error condition and all pending operations.
Order of Calculations
The Algebraic Operating System (AOS™) of the TI-25X
Solar completes operations in the order of priority listed
below.
1. Single-variable functions (trigonometric, logarithmic,
square, square root, factorial, percent, reciprocal, angle
conversion, and change sign).
2. Two-variable functions:
x
¦ Exponential (y
¦ Multiplication and division
¦ Addition and subtraction
) and roots (x‡y)
3. l completes all operations.
4.ENG
Basic Functions
Key
Functionp, o,n,
m
Perform addition, subtraction, multiplication,
and division.
Example: 12 n 5 p 60
l
120.
l
Completes all pending operations.
Example: 4 n 5 p 9
l
29.
@
Changes the sign (positive or negative) of
the displayed number.
Example: 8 @ p 12
l
4.
i j
Operations enclosed in parentheses are
given priority over operations outside the
parentheses. You can enter up to 15 levels
of parentheses. l closes any open
parenthetical expressions.
Example: 12 n i 5 p 6
l
132.
`
{
Enters the value of p.
E
Calculates the factorial of the displayed
number.
Example: 5
E
120.
I
Converts the displayed number from a
percentage to a decimal.
Example: 25
I
0.25
p
n I
l
Adds n% to the displayed number.
o
n I
l
Subtracts n% from the displayed number.
n
n I
l
Multiplies the displayed number by n%.
m n I
l
Divides the displayed number by n%.
5.ENG
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