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Caution
This symbol is used to indicate information that can result in personal injury or material damage if ignored.
Batteries
· After removing the batteries from the calculator, put
them in a safe place where there is no danger of them getting into the hands of small children and accidently swallowed. · Keep batteries out of the reach of small children. If accidently swallowed, consult with a physician immediately. · Never charge batteries, try to take batteries apart, or allow batteries to become shorted. [. . . ] kInput Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 29 30 31 31 33
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Two-line Display
You can simultaneously check the calculation formula and its answer.
The first line displays the calculation formula. The second line displays the answer.
5
Key Layout Key Layout
< fx-991WA > Page
SHIFT
11
ALPHA
REPLAY
8
2
MODE ON/CLEAR
Page
15 27
x!LOGIC
24
CONV
17
Rec(
15 14 28
HEX
Page 15 Page 17 23 Page Page Page Page 16 10
A
25 11 11 28 10
B
17
DEC
15 14 27
10 BIN
14 14 27
e
OCT
14 10
C
15 10
sin-1 D
14 13 10
cos-1 E
14 13 10
tan-1 F
DISTR
10 19
Re<->lm
28 23
13 20 23
r arg
13 23 10
Abs
X
13 19 10
Y
10 10
MM
DT CL
Page Page
10 20 16
A M
10 10 10 20 16 20 16
B G
19 8
INS
10 10 18
McI ScI
19
C
T
Page Page
20 16
y
µ
20 16
m
20 16
k
8 18
nPr
18
nCr
Page
18 16
f
18 16
p
18 16
n
20
20
y
Page
15
Rnd
15
Ran#
15
14
DRG
12
Page
CONV
10 18
nPr
9
nPr
fx-115WA: 18 6
nCr
Before Starting Calculations. . .
k Modes
Application Calculation Modes Normal calculations Complex number calculations Standard deviation calculations Regression calculations Base-n calculations COMP CMPLX SD CMPLX SD Mode Name Mode Indicator
REG REG BASE-N b (binary) o (octal) d (decimal) H (hexadecimal) DEG RAD GRA
Angle Unit Modes Degrees Radians Grads Display Modes Exponential notation (Canceling FIX and SCI specification) Number of decimal place specification Number of significant digit specification Exponential display range specifications
R T B
Fix Sci ENG
NORM1 NORM2 FIX SCI ENG
Note!
· Mode indicators appear in the lower part of the display, except for the Base-n indicators which appear in the exponent part of the display. · The ENG mode cannot be selected while the calculator is in the CMPLX or BASE-N mode. 7
· You cannot set the angle unit or the display mode while the calculator is in the BASE-N mode. · The COMP, CMPLX, SD, and REG modes can be used in combination with the angle unit modes. · Be sure to check the current calculation mode (SD, REG, COMP, CMPLX) and angle unit mode (DEG, RAD, GRA) before beginning a calculation.
k Input Capacity
· The memory area used for calculation input can hold 79 "steps. " Whenever you input the 73rd step of any calculation, the cursor changes from "_" to "k" to let you know memory is running low. If you still need to input more, you should divide your calculation into two or more parts.
k Making Corrections During Input
· Use e and r to move the cursor to the location you want. · Press [ to delete the number or function at the current cursor position. · Values are automatically displayed in decimal format whenever the total number of digits of a fractional value (integer numerator denominator separator marks) exceeds 10. · Example 1 : 2 3 1 4 5
2C3 +1C 4C 5= · Example 2 : 1 2 1. 6 1 C 2 + 1. 6 =
2 7 15. 00
2. 100
· Fraction/decimal calculation results are always decimal.
k Decimal-to-Fraction Conversion
· Example: 2. 75 2 3 4 2. 75 =
2. 75 2 3 4. 00 11 4. 00
C AB
k Fraction-to-Decimal Conversion
· Example: 1 0. 5 (Fraction Decimal) 2 1C 2= 11
1 2. 00
Percentage Calculations
· Use the COMP mode for percentage calculations. · Example 1 : To calculate 12% of 1500 1500 - 12 A v
180. 00
· Example 2 : To calculate what percentage of 880 is 660 660 \ 880 A v · Example 3 : To add 15% onto 2500 2500 - 15 A v + · Example 4 : To discount 3500 by 25% 3500 - 25 A v ,
75. 00
2875. 00
2625. 00
· Example 5: If 300 grams are added to a test sample originally weighing 500 grams, what is the percentage increase in weight?· Example 2: 1Ö 3, displaying result with two significant digits (SCI 2)
FFFF2 21 \3 =
3. 301
Sci
· Press F F F F 3 1 to clear SCI specification.
k ENG Calculations
· Example 1: To convert 56, 088 meters to kilometers 56088 = J
56. 088003
· Example 2: To convert 0. 08125 grams to milligrams 0. 08125 = J
81. 2503
k Inputting ENG Calculation Symbols
· F F F F F 1 enters the ENG mode in which ENG symbols can be used in calculations. · To exit the ENG mode, press F F F F F 2. · The following are the nine ENG symbols that can be used in ENG mode calculations. Key Operation
Ak AM Ag At Am AN An Ap Af
Unit 103 106 109 1012 103 106 109 1012 1015 16
Symbol k (kilo) M (Mega) G (Giga) T (Tera) m (milli) µ (micro) n (nano) p (pico) f (femto)
* For displayed values, the calculator selects the ENG symbol that makes the numeric part of the value fall within the range of 1 to 1000. * ENG symbols cannot be used when inputting fractions. * The ENG mode cannot be used in combination with the CMPLX, or BASE-N modes. · Performing any of the key operations in the above table while you are not in the ENG mode inputs the exponential value in the "Unit" column (without inputting the ENG symbol). [. . . ] · Action · Simplify the calculation. The numeric stack has 10 levels and the operator stack has 24 levels. · Divide your calculation into two or more separate parts.
Syn ERROR
· Cause · Attempt to perform an illegal mathematical operation.
29
· Action · Press e or r to display the calculation with the cursor located at the location of the error. Make necessary corrections.
Arg ERROR
· Cause · Improper use of argument · Action · Press e or r to display the location of the cause of the error and make required corrections.
k Order of Operations
Calculations are performed in the following order of precedence. [. . . ]
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