Casio FX-82SX Plus User Manual

• The displays and illustrations (such as key markings) shown in 

this User’s Guide are for illustrative purposes only, and may differ 
somewhat from the actual items they represent.

 • The contents of this manual are subject to change without notice.
  • In no event shall CASIO Computer Co., Ltd. be liable to anyone 

for special, collateral, incidental, or consequential damages in 
connection with or arising out of the purchase or use of this product 
and items that come with it. Moreover, CASIO Computer Co., Ltd. 
shall not be liable for any claim of any kind whatsoever by any other 
party arising out of the use of this product and the items that come 
with it.

 • Be sure to keep all user documentation handy for future reference.

Sample operations in this manual are indicated by a 

 icon. Unless 

specifically stated, all sample operations assume that the calculator is 
in its initial default setup. Use the procedure under “3. Initializing the 
Calculator” to return the calculator to its initial default setup.

Perform the following procedure when you want to initialize the 
calculator and return the calculation mode and setup to their initial 
default settings. Note that this operation also clears all data currently 
in calculator memory.

fx-82MS/85MS/300MS/350MS: 

p!,(CLR)3(All)=

fx-82SX PLUS/220 PLUS: 

pr3(All)=

 

 

  • Keep batteries out of the reach of small children. 
  • Use only the type of battery specified for this calculator in this 

manual. 

  •  Dim figures on the display of the calculator indicate that battery 

  •  The battery that comes with the calculator discharges slightly 

during shipment and storage. Because of this, it may require 
replacement sooner than the normal expected battery life.  

  •  Do not use an oxyride battery* or any other type of nickel-based 

  •  Avoid use and storage of the calculator in areas subjected 

to temperature extremes, and large amounts of humidity and 
dust.  

  •  Do not subject the calculator to excessive impact, pressure, 

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E

  •  Never try to take the calculator apart.  
  •  Use a soft, dry cloth to clean the exterior of the calculator.  
  •  Whenever discarding the calculator or batteries, be sure to 

do so in accordance with the laws and regulations in your 
particular area.  

  * Company and product names used in this manual may be registered 

trademarks or trademarks of their respective owners. 

  Before using the calculator, slide 
its hard case downwards to 
remove it, and then affix the hard 
case to the back of the calculator 
as shown in the illustration 
nearby. 

 

 

 

 

 

 

  Press  

O to turn on the calculator.

  Press  

1A(OFF) to turn off the calculator.

   Auto Power Off 
  Your calculator will turn off automatically if you do not perform any 
operation for about 10 minutes. 

  1. Press  the   

, key a number of times until 

you reach the setup screen shown to the 
right.

  2. Press   

c. 

  3. Use   

d and  e to adjust contrast. 

  4. After the setting is the way you want, press  

A. 

 

 

   Important:  If adjusting display contrast does not improve display 
readability, it probably means that battery power is low. Replace 
the battery. 

  The display of the calculator shows expressions you input, calculation 
results, and various indicators. 

 

  
  
  

  
  
  
  

  

 
  
  

 General calculations 

N1(COMP) 

 Standard deviation 

N2(SD) 

 Regression calculations (fx-82MS/85MS/
300MS/350MS only)  

N3(REG) 

   Note:  • The initial default calculation mode is the COMP Mode.  
• Mode indicators appear in the upper part of the display. Be sure to 
check the current calculation mode (COMP, SD, REG) and angle unit 
setting (Deg, Rad, Gra) before beginning a calculation. 

  Pressing the  

, key more than once displays additional setup 

screens. Underlined ( ___ ) settings are initial defaults. 

 

 
1Deg    2Rad    3Gra      Specifies degrees, 
radians or grads as the angle unit for value 
input and calculation result display.

Note: In this manual, the 

v symbol next to a sample operation 

indicates degrees. 

1Fix    2Sci    3Norm     Specifies the 
number of digits for display of a calculation 
result.
  Fix:  The value you specify (from 0 to 9) controls the number of decimal 
places for displayed calculation results. Calculation results are 
rounded off to the specified digit before being displayed.
  Example: 100 ÷ 7 = 14.286   (Fix 3)

   Sci:  The value you specify (from 1 to 10) controls the number of 
significant digits for displayed calculation results. Calculation results 
are rounded off to the specified digit before being displayed.
  Example: 1 ÷ 7 = 1.4286  

×  10 

–1 

  (Sci 5)

   Norm:  Selecting one of the two available settings ( Norm 1 , Norm 
2) determines the range in which results will be displayed in non-
exponential format. Outside the specified range, results are displayed 
using exponential format.
  Norm 1: 10 

–2 

  

  | 

|, | 

|  

  10 

10 

     Norm 2: 10 

–9 

  

  | 

|, | 

|  

  10 

10 

 Example: 1 ÷ 200 = 5 

× 10

–3

 (Norm 1);  0.005 (Norm 2) 

 

b

e

d

1ab/c    2 d/c      Specifies either mixed fraction (ab/c) or improper 
fraction (d/c) for display of fractions in calculation results. 
1Dot    2 Comma      Specifies whether to display a dot or a 
comma for the calculation result decimal point. A dot is always 
displayed during input. 

 Perform the following procedure to initialize the calculator, which 
returns the calculation mode to COMP and returns all other settings, 
including setup menu settings, to their initial defaults. 

 

 

 fx-82MS/85MS/300MS/350MS: 

p1,(CLR)c(Mode)=

fx-82SX PLUS/220 PLUS: 

prc(Mode)=

   4 

 

×  sin30  ×  (30 + 10  ×  3) = 120   v

 

 

   

 4  

*s 30  *( 30  + 10  * 3  )=

 

 

   Note:  • The memory area used for calculation input can hold 79 
“steps”. One step is taken up each time you press a number key 
or arithmetic operator key ( 

+,  -,  *,  /). A  ! or  a (fx-

82MS/85MS/300MS/350MS only) key operation does not take up a 
step, so inputting  

!W( 

3  

'), for example, takes up only one step. 

• Whenever you input the 73rd step of any calculation, the cursor 
changes from “_” to “ 

k” to let you know memory is running low. 

 

 

  When the priority of two expressions is the same, the calculation is 
performed from left to right. 

 1st 

 Function with parentheses: Pol( 

,  

), Rec( 

,  

), 

RanInt#( 

,  

)* (*fx-82SX PLUS/220 PLUS only) 

 2nd 

 Type A functions: With these functions, the value is 
entered and then the function key is pressed. ( 

3 

,  

2 

,  

−1 

, 

 

!, ° ’ ”,  

m,  m

1 

,  

m

2 

,  

n, °,  

r 

,  

g 

)  

 3rd 

 Powers and roots: ^( 

),  

'

 4th  

Fractions 

 5th 

 Implied multiplication of  

π ,  

 (natural logarithm base), 

memory name, or variable name: 2 

π , 3 

, 5A,  

π A, etc.  

 6th 

 Type B functions: With these functions, the function key is 
pressed and then the value is entered. ( 

',  

3  

', log, ln, 

 

, 10 

, sin, cos, tan, sin 

−1 

, cos 

−1 

, tan 

−1 

, sinh, cosh, tanh, 

sinh 

−1 

, cosh 

−1 

, tanh 

−1 

, (−))  

 7th 

 Implied multiplication of Type B functions: 2 

'

3, Alog2, etc.  

 8th  

Permutation ( n P r ), combination ( n C r ) 

 9th 

 Multiplication, division ( 

× , ÷) 

 10th  

Addition, subtraction (+, –) 

   To delete a single character or function: 
  1234_  

→   ddD  →  12 4 

  
    To insert a character or function into a calculation: 
  123_  

→   d!D(INS) e  →  1243

  • The cursor changes from “_” to “ 

t”. 

  
    To clear all of the calculation you are inputting:  Press  

A.

   

2 + 1 =   1

3     2       6

1

  

2  

 

$  3   +  1   $  2   = 

 

{1  {6. 

 

 

   

1  =  1

2    2

4 − 3

  

4  

- 3  $ 1  $ 2  = 

 

{2.

 

  

    Note:   • Mixing fractions and decimal values in a calculation will cause 
the result to be displayed as a decimal value.  • Fractions in calculation 
results are displayed after being reduced to their lowest terms.

  
    To switch a calculation result between improper fraction and 
mixed fraction format:   Press   

1$( d/c ).  

  
    To switch a calculation result between fraction and decimal 
format:   Press   

$. 

   150 

 

×  20% = 30 

150  

* 20  1=(%)  

   

Calculate what percentage of 880 is 660. (75%)

    

 

660 

 

/ 880  1=(%)  

   

Increase 2500 by 15%. (2875)

    

2500 

 

* 15  1=(%) + 

 

   

Discount 3500 by 25%. (2625)

    

3500 

 

* 25  1=(%) - 

 

   

 If 300 grams are added to a test sample originally weighing 
500 grams, what is the percentage increase in weight? 
(160%)

    

300 

+500 !=(%)  

   

 What is the percentage change when a value is increased 
from 40 to 46? (15%)

    

46 

-40 !=(%)  

 

 

 

 

 The following is the input format for a sexagesimal value: {degrees} 
$ {minutes} $ {seconds} $. 

k

k

k

k

k

k

Note: You must always input something for the degrees and minutes, 
even if they are zero. 

 

2°20´30˝ + 39´30˝ = 3°00´00˝

    2 

 

$ 20  $ 30  $+ 0  $ 39  $ 30  $= 

 

   

Convert 2°15´18˝ to its decimal equivalent.

    

2 

 

$ 15  $ 18  $=   

   

 

(Converts sexagesimal to decimal.)   

$ 

 

  

  (Converts decimal to sexagesimal.)  

!$(←) 

 You can use the colon character (:) to connect two or more 
expressions and execute them in sequence from left to right when 
you press  

=. 

 

 

   

3 + 3 : 3  

×  3   

3  

+ 3  Sr(:) 3  * 3  = 

 

   

 

= 

 A simple key operation transforms a displayed value to engineering 
notation. 

 

 

   

Transform the value 1234 to engineering notation, shifting the 

 

decimal point to the right.

    

1234 

 

= 

 

    

 

 

W  

  

 

W 

 In the COMP Mode, the calculator remembers up to approximately 
150 bytes of data for the newest calculation. You can scroll through 
calculation history contents using  

f and  c. 

 

 

   

1 + 1 = 2 

 

1  

+ 1  = 

 

   

2 + 2 = 4 

2  

+ 2  = 

 

    

3 + 3 = 6 

3  

+ 3  = 

 

    

 

(Scrolls back.)   

f 

 

    

 

(Scrolls back again.)   

f 

 

 
Note: Calculation history data is all cleared whenever you press 

O, 

when you change to a different calculation mode, or whenever you 
initialize modes and settings. 

  While a calculation result is on the display, you can press  

d or  e 

to edit the expression you used for the previous calculation. 

 

 

   

 4 × 3  + 2.5 = 14.5 

4  

* 3  + 2.5  = 

 

   

 4 × 3  − 7.1 = 4.9

  

(Continuing) 

 

dYYYY- 7.1  = 

 

 

  

 

 

  The last calculation result obtained is stored in Ans (answer) memory.  
Ans memory contents are updated whenever a new calculation 
result is displayed.

   

To divide the result of 3  

×  4 by 30 

 

 

    

3 

 

* 4  = 

 

 

 

 

    

(Continuing) 

 

/ 30  = 

   

123 + 456 =  579   

123  

+ 456  = 

 

    

789 –  579  = 210  

(Continuing) 789  

-G= 

 

 

  

 

 

  Your calculator has eight preset variables named A, B, C, D, E, F, 
X, and Y. 

 

 

   

To assign the result of 3 + 5 to variable A

    

3 

 

+ 5  1t(STO) y(A)  

    

To multiply the contents of variable A by 10

   

 

(Continuing)   

Sy(A) * 10  = 

 

    

To recall the contents of variable A

 

 

(Continuing)   

ty(A)  

    

To clear the contents of variable A

 

 

 0  

1t(STO) y(A)  

  You can add calculation results to or subtract results from independent 
memory. The “M” appears on the display when there is any value 
other than zero stored in independent memory. 

 

 

   

To clear the contents of M

 fx-82MS/85MS/300MS/350MS: 
 0 

1t(STO)l(M) 

fx-82SX PLUS/220 PLUS: 

0 

1n(Min) 

k

k

k

k

k

k

k

  

To add the result of 10  

×  5 to M

  

(Continuing) 

10 

 

* 5  l 

 

    

To subtract the result of 10 + 5 from M 

  

(Continuing) 

10 

 

+ 5  1l(M–)  

    

To recall the contents of M 

 fx-82MS/85MS/300MS/350MS: 
  

(Continuing) 

 

tl(M)  

   fx-82SX PLUS/220 PLUS: 

(Continuing)  

n 

 

    Note:  Variable M is used for independent memory. 

 

 

  Independent memory and variable contents are retained even if you 
press  

A, change the calculation mode, or turn off the calculator. 

Perform the following procedure when you want to clear the contents 
of all memories.

 fx-82MS/85MS/300MS/350MS: 

p!,(CLR)1(Mcl)= 

fx-82SX PLUS/220 PLUS: 

pr1(Mcl)=

 
   π   :    π  is displayed as 3.141592654, but  π  = 3.14159265358980 is 
used for internal calculations. 

 (fx-82MS/85MS/300MS/350MS only) :   

 is displayed as 

2.718281828, but  

 = 2.71828182845904 is used for internal 

calculations.

:  Trigonometric functions. Specify 

the angle unit before performing calculations. See 

. 

:  Hyperbolic functions. The 

angle unit setting does not affect calculations. See 

. 

:  These functions specify the angle unit. ° specifies degrees, 

 

r 

 radians, and  

g 

 grads. Input a function from the menu that appears 

when you perform the following key operation:  

1G(DRG '). 

See 

. 

,  

  :  Exponential functions. See 

. 

:  Logarithmic function. See 

. 

:  Natural logarithm to base  

. See 

. 

'

',  

'

',  

'

',  

:  Powers, power roots, and 

reciprocals. See 

. 

   Pol, Rec   :  Pol converts rectangular coordinates to polar coordinates, 
while Rec converts polar coordinates to rectangular coordinates. 
See 

.

  Pol( 

,  

) = ( 

,   )          Rec( 

,   ) = ( 

,  

) 

 

 

 

 

 

 

 

 

 

 

k

  Specify the angle unit 
before performing 
calculations.
  Calculation result  

θ  is 

displayed in the range 
of −180°  

   

θ        180°. 

 

 

 

 

 

 

 

 

!   :  Factorial function. See 

. 

   Ran#   :  Generates a 3-digit pseudo random number that is less than 
1. See 

.

   RanInt#  (fx-82SX PLUS/220 PLUS only) :  For input of the function 
of the form RanInt#( 

,  

), which generates a random integer within 

the range of  

 to  

. See 

. 

  :  Permutation ( n P r ) and combination ( n C r ) functions. See 

. 

   Rnd   :  The argument of this function is made a decimal value and 
then rounded in accordance with the current number of display digits 
setting (Norm, Fix, or Sci). With Norm 1 or Norm 2, the argument is 
rounded off to 10 digits. See 

. 

   Note:  Using functions can slow down a calculation, which may delay 
display of the result. To interrupt an ongoing calculation before its 
result appears, press  

A.

 

 

   

   sin 30°= 0.5       

v 

 

s 30  = 

 

 

     

  sin 

−1 

0.5 = 30°   

v 

 

1s(sin 

−1 

) 0.5  

= 

 

   

   sinh 1 = 1.175201194  

 

ws(sinh) 1  =  

 

 

  cosh 

–1 

 1 = 0  

 

 

w1c(cosh 

−1 

) 1  

= 

 

   

   

π  /2 radians = 90°, 50 grads = 45°      v

 

 

(1E(π)/ 2 )1G(DRG')c(R)= 

  50 

 

1G(DRG ') d(G) = 

 

    

  To calculate  

5  

 ×  2 to three significant digits (Sci 3)

 

 

N  2(Sci) 3 

 

1i( 

) 5  

* 2  =   

   

  log 1000 = 3 

 

 

l 1000  = 

 

 

 

   

  To calculate ln 90 (= log 

 90) to three significant digits (Sci 3) 

 

 

N  2(Sci) 3 

 

i 90  =   

    

1.2 

 

×  10 

3 

 = 1200  

1.2  

* 10  M 3  = 

 

  

  (5 

2 

) 

3 

 = 15625  

 

( 5  x)W= 

 

k

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