Casio FX250HC - Basic Scientific Calculator User manual

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NQPOR
fx-82SX/
fx-250HC
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CASIO ELECTRONICS CO., LTD.
Unit 6, 1000 North Circular Road,
London NW2 7JD, U.K.

— 1 —
Contents
Handling Precautions … 2
Modes … 3
Basic Calculations … 5
Constant Calculations … 6
Memory Calculations … 7
Fraction Calculations … 8
Percentage Calculations … 10
Scientific Function Calculations … 11
Statistical Calculations (SD Mode) … 16
Technical Information … 18
ENGLISH 1
ESPAÑOL 33
FRANÇAIS 66
DEUTSCH 99
ITALIANO 134

— 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 temperature, 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
operations are being performed correctly.
•Never leave dead batteries in the battery compartment.
They 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 de-
tergent 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. The user
should prepare physical records of data to protect against
such data loss.
•Never dispose of batteries, the liquid crystal panel, or other
components by burning them.

— 3 —
•Before assuming malfunction of the unit, be sure to care-
fully reread this manual and ensure that the problem is not
due to low battery power 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 above the display screen.
•DEG, RAD, and GRA modes can be used in combination
with the COMP and SD modes.
•F9does not exit SD mode.
•F0exits SD mode.
•F0does 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.
6
45
–25.5
268.8
6.66666666719
36.
0.3
122.

— 6 —
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) =
•Example 4: 1.748.3521
(1.72)1.7 --=
(1.73)=
(1.74)=
K27.6
K5.3
K4.913
K8.3521
K2.89
K34.
K51.
K68.
K8.3
K–108.

— 7 —
Memory Calculations
•Use the COMP mode for memory calculations.
•Use Y, |, A{and Zfor memory calculations.
Yreplaces current memory contents.
•“M” appears when there is a value in memory.
•To clear memory, press 0Yor tY.
•Example 1: (536)(238)(562)(994)210.75
(536) 53 +6 =Y
(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.
M15.
M210.75
M13.
M24.75
M112.
M59.

— 8 —
•Example 3: To calculate the following using memory and
a constant: (123)(453)(783)135.
(123) 3 --12 =Y
(453) 45 A{
(783) 78 |
(Memory recall) Z
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
=
MK 234.
MK 135.
MK 36.
MK 135.
2 4.
12.
17 15.
411 12.
2
4
1
2
7
15
2
3
4
5
1
4
2
3
11
12

— 9 —
•Example 4: 1.62.1
1 C2 +1.6 =
Fraction/decimal calculation result is always decimal.
•Example 5: ↔0.5 (Fraction ↔Decimal)
1 C2 =
C
C
•Example 6: 1↔
1 C2 C3
AB
AB
2.1
1
2
1 2.
12.
0.5
1
2
12 3.
5 3.
2
3
5
3
12 3.

— 10 —
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+
•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
2875.
K276.
180.
75.
2625.
K144.
K216.

— 11 —
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 ↔Decimal Conversion
•Example: 14°25’36” ↔14.42667
14 I25 I36 I
AO
kTrigonometric/Inverse Trigonometric Functions
•Example 1: sin ( rad) (RAD mode)
Ax\6 =S
•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 L\2 =AV

6
14.42666667
14°25°36
0.440283084
0.5
RAD
DEG
–0.612800788
GRA
0.785398163
RAD
2
2

— 12 —
Iog 64
Iog 4
.4 AQ+
5 -3 EAU=
4.094622224
18.28545536
0.089905111
4.49980967
2.760821773
8.
0.125
22026.46579
3.
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
•Example 5: 232 Aw3 =
•Example 6: 232 Aw3 E=
•Example 7: e10 10 AU

— 13 —
•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 L+3 L-5 L=
•Example 2: 35 327
5 AD+27 EAD=
•Example 3: 123302
123 +30 AK=
•Example 4:
3 AX,4 AX=AX
–0.278567983
0.526540784
2.
5.287196909
To convert to antilogarithm:
1023.
–1.290024053
1 1
3 4
1
12.
DEG
DEG

— 14 —
0.00
FIX
2.47
FIX
40320.
3.3–01
SCI
0.0 00
SCI
•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 F9 to clear FIX specification.
•Example 3: 13 , displaying result with two significant
digits (SCI 2).
F82
1 \3 =
•Press F9 to clear SCI specification.
•Example 4: To convert 56,088 meters to kilometers.
56088 J
2.46
FIX
56.088 03

— 15 —
81.25–03
0.664
1.
DEG
2.
1.732050808
DEG
1.047197551
RAD
840.
Example (results differ each time)
RAD
•Example 5: To convert 0.08125 grams to milligrams.
.08125 J
•Example 6: To generate a random number between 0.000
and 0.999.
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 L=
θ AN
kPermutation
•Example: To determine how many different 4-digit values
can be produced using the numbers 1 through 7.
7 Am4 =

— 16 —
210.
kCombination
•Example: To determine how many different 4-member
groups can be organized in a group of 10 individuals.
10 An4 =
Statisticasl 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 F9 first.
• 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
Input Data. Au55 }
54 }51 }
55 }53 }}
54 }52 }
Sample standard deviatio n Aq
Population standard deviation Ap
0.
SD
52.
SD
1.407885953
SD
1.316956719
SD

— 17 —
Arithmetic mean A`
Number of data Ar
Sum of values Ao
Sum of squares of values Aa
• }} inputs the same data twice (as above).
•You can also input multiple entries of the same data using
-. To input the data 110 ten times, for example, press
110 -10 }.
•The above results can be obtained in any order, and not
necessarily that shown above.
•To delete data you have just input, press A[.
8.
SD
427.
SD
22805.
SD
53.375
SD

— 18 —
• Example 2: To change data you previously input.
Correction
Actual Correction
51 }50 }A[
51 }
130 -
31 }
130 -
31 }
120 -
120 -
31
t130 -
31 }
t130 -
31 }
51 }
130 -
31 }
49 }
120 -
30 }
49 A[
51 }
120 -30 A[130 -
31 }
Correct Actual
Correct
kMaking Corrections During Data Input
• Example 1: To change data you have just input.
Technical Information
kKey and Their Functions
•General
Arithmetic calculations .......................... +, ,, -,
............. \, =