Casio fx-260 User manual

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fx-82SOLAR
fx-85B
fx-260SOLAR
fx-280
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fx-82SOLAR/
fx-260SOLAR
fx-85B/fx-280
ENGLISH 1
ESPAÑOL 36
FRANÇAIS 73
DEUTSCH 110
ITALIANO 147

— 1 —
Contents
Handling Precautions … 2
Modes … 3
Basic Calculations … 5
Constant Calculations … 6
Memory Calculations … 7
Fraction Calculations … 9
Percentage Calculations … 10
Scientific Function Calculations … 11
Statistical Calculations (SD Mode) … 18
Technical Information … 21
CASIO ELECTRONICS CO., LTD.
Unit 6, 1000 North Circular Road,
London NW2 7JD, U.K.

— 2 —
Handling Precautions
•Your calculator is made up of precision components. Never
try to take it apart.
•Avoid dropping your calculator and otherwise subjecting it
to strong impact.
•Do not store the calculator or leave it in areas exposed to
high temperature or humidity, or large amounts of dust.
When exposed to low temperatures, the calculator may
require more time to display results and may even fail to
operate. Correct operation will resume once the calculator
is brought back to normal temperature.
•The display will go blank and keys will not operate during
calculations.When you are operating the keyboard, be sure
to watch the display to make sure that all your key opera-
tions are being performed correctly.
•Never leave the dead battery (fx-85B/fx-280) in the battery
compartment. It can leak and damage the unit.
•Avoid using volatile liquids such as thinner or benzine to
clean the unit. Wipe it with a soft cloth, or with a cloth that
has been dipped in a solution of water and a neutral deter-
gent and wring out.
•In no event will the manufacturer and its suppliers be liable
to you or any other person for any damages, expenses,
lost profits, lost savings, or any other damages arising out
of malfunction, repairs, or battery replacement (fx-85B/fx-
280), or insufficient light. The user should prepare physical
records of data to protect against such data loss.
•Never dispose of battery (fx-85B/fx-280), the liquid crystal
panel, or other components by burning them.
•Before assuming malfunction of the unit, be sure to care-

— 3 —
fully reread this manual and ensure that the problem is not
due to low battery power (fx-85B/fx-280) or operational
error.
•The contents of this manual are subject to change without
notice.
•No part of this manual may be reproduced in any form
without the express written consent of the manufacturer.
•Keep this manual on hand for future reference.
Modes
*Display indicators show current mode setting. Absence of
display indicator indicates COMP Mode.
Key
Operation
Mode
Name*
Standard deviation calculations
Normal calculations
Calculations using grads
Calculations using radians
Number of decimal place
specification
Number of significant digit
specification
Cancels FIX and SCI settings
Calculations using degrees
F0
F4
F5
F6
F7
F8
F9
SD
COMP
DEG
RAD
GRA
FIX
SCI
Fl
Application
NORM

— 4 —
Note!
•Amode guide is located at the top of the display screen.
•DEG, RAD, and GRA modes can be used in combination
with COMP and SD modes.
•F9 does not exit SD mode.
•F0 exits SD mode.
•F0 does not clear SCI or FIX specifications.
•Always press tbefore entering DEG, RAD, and GRA
modes.
•Remember to always set the operating mode and angular
unit (DEG, RAD, GRA) before starting your calculation.

— 5 —
Basic Calculations
•Use the COMP mode for basic calculations.
•Example 1: 234.553
23 +4.5 ,53 =
•Example 2: 56(12)(2.5)
56 -12 E\2.5 E=
•Example 3: 23(11020)
2 \3 -1 e20 =
•Example 4: 7845=36
7 -8 ,4 -5 =
•Example 5: =0.3
4 -5 \6 AN=
•Example 6: 2[76(54)]122
2 -O7 +6 -
O5 +4 PP=
•You can skip all Poperations before the =key.
122.
0.3
6
45
36.
–25.5
6.66666666719
268.8

— 6 —
•Example 7: 4/3π53
4 \3 -Ax-5 AN=
Constant Calculations
•Press +, ,, -or \twice after inputting a number to
make that number a constant.
•“K” is on the display while a constant is being used.
•Use the COMP mode for constant calculations.
•Example 1: 2.33, then 2.36
(2.33) 2.3 ++3 =
(2.36) 6 =
•Example 2: 122.3, then 12(9)
(122.3) 12 --2.3 =
(12(9)) 9 E=
•Example 3: 1717171768
(1717) 17 ++=
(171717) =
(17171717) =
523.5987756
K8.3
K27.6
K–108.
K5.3
K34.
K68.
K51.

— 7 —
K2.89
K4.913
K8.3521
•Example 4: 1.748.3521
(1.72)1.7 --=
(1.73)=
(1.74)=
Memory Calculations
•Use the COMP mode for memory calculations.
•Use AY, |, A{and Zfor memory calculations.
AYreplaces current memory contents.
•“M” appears when there is a value in memory.
•Toclear memory, press 0AYor tAY.
•Example 1: (536)(238)(562)(994)210.75
(536) 53 +6 =AY
(238) 23 ,8 |
(562) 56 -2 |
(994) 99 \4 |
(Memory recall) Z
•Example 2: To calculate the following using memory as
shown.
M59.
M15.
M112.
M24.75
M210.75

— 8 —
•Example 3: To calculate the following using memory and
a constant: (123)(453)(783)135.
(123) 3 --12 =AY
(453) 45 A{
(783) 78 |
(Memory recall) Z
kAdditional fx-85B/fx-280 Memory Calculations
•The fx-85B/fx-280 has two additional memories named A
and B.
•Use AJto store data and 0to recall data.
•Storing data in a memory replaces anything stored there
previously.
•Toclear a memory, store a zero in it.
•Example 1: To input 123 in memory A.
t123 AJ1
MK 135.
MK 234.
MK 135.
M13.
MK 36.
123.

— 9 —
t01
•Example 2: To store the results of 123 456 in memory B.
t123 -456 AJ2
t02
Fraction Calculations
•Use COMP mode for fraction calculations.
•Total number of digits (including division marks) cannot
exceed 10.
•Example 1:  1
2 C3 +4 C5 =
•Example 2: 3 1 4
3 C1 C4 +
1 C2 C3 =
•Example 3: 2 C4
=
•Example 4: 1.62.1
1 C2 +1.6 =
Fraction/decimal calculation result is always decimal.
123.
2
3
4
5
17 15.
411 12.
1
4
2
3
11
12
2 4.
1 2.
1
2
1
2
56088.
56088.
7
15
2.1
2
4

— 10 —
•Example 5: ↔0.5(Fraction ↔Decimal)
1 C2 =
C
C
•Example 6: 1↔
1 C2 C3
AB
AB
Percentage Calculations
•Use COMP mode for percentage calculations.
•Example 1: To calculate 12% of 1500.
1500 -12 Av
•Example 2: To calculate what percentage of 880 is 660.
660 \880 Av
•Example 3: To add 15% onto 2500.
2500 -15 Av+
5 3.
12 3.
0.5
12 3.
1 2.
12.
1
2
2
3
5
3
180.
75.
2875.

— 11 —
•Example 4: To discount 3500 by 25%.
3500 -25 Av,
•Example 5: To calculate the following using a constant.
12% of 1200 = 144
18% of 1200 = 216
23% of 1200 = 276
(12%) 1200 --12 Av
(18%) 18 Av
(23%) 23 Av
Scientific Function Calculations
•Use COMP mode for scientific function calculations.
•Some calculations may take a long time to complete.
•Wait for result before starting next calculation.
• =3.1415926536.
kSexagesimal Functions
•Example 1: 14°25’36” + 12°23’34” = 26°49’10”
14 I25 I36 I+
12 I23 I34 I=
2625.
K144.
K216.
K276.
26°49°10.

— 12 —
•Example 2: 1°2’3” + 4.56 = 5.594166667
1 I2 I3 I+4.56 =
•Example 3: sin 87°65’43.21” = 0.999447513 (DEG mode)
87 I65 I43.21 IS
•Example 4: 1.23↔1°13’48”
1.23 I
I
I
•Example 5: 12°34’ ↔12.56666667
12 I34 IAO
You can also use Iwhen inputting values to convert be-
tween sexagesimal and decimal.
kTrigonometric/Inverse Trigonometric
Functions
•Example 1: sin ( rad) (RAD mode)
Ax\6 =S0.5
5.594166667
0.999447513
1°13°48.
1.23
1°13°48.
12.56666667
RAD

6

— 13 —
•Example 2: cos 63°52’41” (DEG mode)
63 I52 I41 IW
•Example 3: tan (35gra)(GRA mode)
35 Eh
•Example 4: cos–1 ( rad) (RAD mode)
2 AL\2 =AV
•Example 5: To c on ve r t 45 degrees to radians, grads, and
back to degrees.
F445
AF5
AF6
AF4
Repeated conversion between angle units can cause nor-
mally minute error to accumulate, resulting in poor preci-
sion.
0.440283084
–0.612800788
DEG
GRA
RAD
2
2
0.785398163
45.
DEG
0.785398163
50.
45.
DEG
RAD
GRA

— 14 —
kHyperbolic/Inverse Hyperbolic Functions
•Example 1: sinh 3.6 3.6 MS
•Example 2: sinh130 30 MAj
kCommon and Natural Logarithms, Exponents
•Example 1: log 1.23 1.23 R
•Example 2: In 90 (loge90) 90 T
•Example 3: 64 R\4 R=
•Example 4: 100.45 e3
.4 AQ+
5 -3 EAU=
•Example 5: 232 w3 =
•Example 6: 232 w3 E=
•Example 7: e10 10 AU
3.
Iog 64
Iog 4
22026.46579
0.125
8.
2.760821773
4.49980967
0.089905111
4.094622224
18.28545536

— 15 —
•Example 8: log sin 40° + log cos 35° (DEG mode)
40 SR+35 WR=
AQ
•Example 9: 81/3 8 As3 =
kSquare Roots, Cube Roots, Squares,
Reciprocals and Factorials
•Example 1: 235
2 AL+3 AL-5 AL=
•Example 2: 35327
5 AD+27 EAD=
•Example 3: 123302
123 +30 K=
•Example 4:
3 AX,4 AX=
AX
DEG
DEG
12.
1 1
3 4
1
0.526540784
–0.278567983
5.287196909
1023.
–1.290024053
2.
To convert to antilogarithm:

— 16 —
•Example 5: 8! 8 Af
kFIX, SCI, NORM, RND, RAN#, ENG
Calculations
•Example 1: 1.2341.234, rounding result to two places
(FIX 2).
F72
1.234 +1.234 =
•Example 2: 1.2341.234, rounding input to two places.
F721.234 Ab+
1.234 Ab=
•Press F9to clear FIX specification.
•Example 3: 13 , displaying result with two significant
digits (SCI 2).
F82
1 \3 =
•Press F9to clear SCI specification.
0.00
2.47
FIX
FIX
2.46
FIX
0.0 00
3.3–01
SCI
SCI
40320.

— 17 —
•Example 4: To convert 56,088 meters to kilometers.
56088 AJ
•Example 5: To convert 0.08125 grams to milligrams.
.08125 AJ
•Example 6: To generate a random number between 0.000
and 0.999.
Example (results differ each time) Ac
kCoordinate Conversion
•Example 1: To convert polar coordinates (r2,  60°) to
rectangular coordinates (x, y). (DEG mode)
x2 Az60 =
yAN
ANswaps displayed value with value in memory.
•Example 2: To convert rectangular coordinates (1, 3) to
polar coordinates (r,
 ). (RAD mode)
r1 Ay3 AL=
56.088 03
81.25–03
0.664
1.
DEG
1.732050808
DEG
RAD
2.

— 18 —
θ AN
kPermutation
•Example: To determine how many different 4-digit values
can be produced using the numbers 1 through 7.
7 Am4 =
kCombination
•Example: To determine how many different 4-member
groups can be organized in a group of 10 individuals.
10 An4 =
Statistical Calculations (SD Mode)
•Press Flto enter the SD Mode for statistical calcula-
tions using standard deviation.
•If FIX or SCI is on the display, press F9first.
•Data input always starts with Au.
•Example: To calculate n1,n, o,n,x, and x2for the
following data : 55, 54, 51, 55, 53, 53, 54, 52.
Enter SD Mode. Fl
840.
210.
0.
SD
RAD
1.047197551