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.