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E
fx-820MS
User's Guide
http://world.casio.com/edu_e/
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CASIO ELECTRONICS CO., LTD. Unit 6, 1000 North Circular Road, London NW2 7JD, U.K.
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E-1
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Safety Precautions Be sure to read the following safety precautions before using this calculator. Keep this manual handy for later reference. Caution This symbol is used to indicate information that can result in personal injury or material damage if ignored. Batteries •After removing the battery from the calculator, put it in a safe place where it will not get into the hands of small children and accidentally swallowed. • Keep batteries out of the reach of small children. If accidentally swallo
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• 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 with- out 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 these materials. Moreover, CASIO Computer Co., Ltd. shall not b
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Take care never to leave the calculator where it might be splashed by water or exposed to large amounts of hu- midity or dust. Such conditions can damage internal cir- cuitry. • Never drop the calculator or otherwise subject it to strong impact. •Never twist or bend the calculator. Avoid carrying the calculator in the pocket of your trou- sers or other tight-fitting clothing where it might be sub- jected to twisting or bending. • Never try to take the calculator apart. • Never press the keys of
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Contents Safety Precautions .................................. 2 Handling Precautions ............................. 3 Two-line Display ...................................... 7 Before getting started... .......................... 7 kModes .................................................................... 7 kInput Capacity ........................................................ 8 kMaking Corrections During Input ........................... 8 kReplay Function ....................................
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kAngle Unit Conversion ......................................... 20 kCoordinate Conversion (Pol (x, y), Rec (r, θ ))..... 21 kEngineering Notation Calculations ....................... 21 Statistical Calculations ......................... 22 Standard Deviation .................................................. 22 Regression Calculations .......................................... 24 Technical Information ........................... 28 kWhen you have a problem...... ............................. 28
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Two-line Display The two-line display makes it possible to view both the calculation formula and its result at the same time. • The upper line shows the calculation formula. • The lower line shows the result. A separator symbol is displayed every three digits when the integer part of the mantissa has more than three dig- its. Before getting started... k Modes Before starting a calculation, you must first enter the cor- rect mode as indicated in the table below. To perform this type of Perform th
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Note! •To return the calculation mode and setup to the initial defaults shown below, press A B 2(Mode) =. Calculation Mode: COMP Angle Unit: Deg Exponential Display Format: Norm 1 b Fraction Display Format: a /c Decimal Point Character: Dot • Mode indicators appear in the upper part of the display. •Be sure to check the current calculation mode (SD, REG, COMP) and angle unit setting (Deg, Rad, Gra) before beginning a calculation. k Input Capacity • The memory area used for calculation input can
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k Replay Function • Every time you perform a calculation, the replay function stores the calculation formula and its result in replay memory. Pressing the [ key displays the formula and result of the calculation you last performed. Pressing [ again back steps sequentially (new-to-old) through past calculations. •Pressing the e or r key while a replay memory cal- culation is on the display changes to the editing screen. •Pressing the e or r key immediately after you finish a calculation displays
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k Exponential Display Formats This calculator can display up to 10 digits. Larger values are automatically displayed using exponential notation. In the case of decimal values, you can select between two formats that determine at what point exponential notation is used. •To change the exponential display format, press the F key a number of times until you reach the exponential display format setup screen shown below. Fi x Sc i Nor m 1 2 3 •Press 3. On the format selection screen that app
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•Press the number key ( 1 or 2) that corresponds to the setting you want to use. 1(Dot): Period decimal point, comma separator 2(Comma): Comma decimal point, period separator k Initializing the Calculator • Perform the following key operation when you want to initialize the calculation mode and setup, and clear re- play memory and variables. A B 3(All) = COMP Basic Calculations k Arithmetic Calculations Use the F key to enter the COMP Mode when you want to perform basic calculations. COMP ......
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2 1 13 • Example 1: 15 3 5 00 2 C 3 + 1 C 5 = 13 15. 1 2 11 • Example 2: 3 1 4 4 3 12 3 C 1 C 4 + 00 1 C 2 C 3 = 4 11 12. 2 1 • Example 3: 2 C 4 = 4 2 1 • Example 4: 1.6 2.1 1 C 2 + 1.6 = 2 • Results of calculations that mix fraction and decimal val- ues are always decimal. uDecimal ↔ Fraction Conversion •Use the operation shown below to convert calculation results between decimal values and fraction values. • Note that conversion can take as long
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uMixed Fraction ↔ Improper Fraction Conversion 2 5 • Example: 1 ↔ 3 3 00 1 C 2 C 3 = 1 2 3. 00 A B 5 3. 00 A B 1 2 3. •You can use the display setup (Disp) screen to specify the display format when a fraction calculation result is greater than one. •To change the fraction display format, press the q key a number of times until you reach the setup screen shown below. Disp 1 •Display the selection screen. 1 •Press the number key ( 1 or 2) that corresponds to the setting you want to use. b 1
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• Example 4: To discount 3500 by 25% (2625) 3500 - 25 A v , • Example 5: To discount the sum of 168, 98, and 734 by 20% (800) 168 + 98 + 734 = g A j q p q - 20 A v , * *As shown here, if you want to use the current Answer Memory value in a mark up or discount calculation, you need to assign the Answer Memory value into a variable and then use the variable in the mark up/discount calculation. This is because the calculation performed when v is pressed stores a result to Answer Memory before the
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• Example 2: To perform the following calculation: 12°34’56” 3.45 43°24°31.2 12 I 34 I 56 I - 3.45 = kFIX, SCI, RND •To change the settings for the number of decimal places, the number of significant digits, or the exponential dis- play format, press the F key a number of times until you reach the setup screen shown below. Fi x Sc i Nor m 1 2 3 •Press the number key ( 1, 2, or 3) that corresponds to the setup item you want to change. 1 (Fix): Number of decimal places 2 (Sci): Number o
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• Example 2: 1 3, displaying result with two significant digits (Sci 2) SCI ..... (Sci) F 2 2 1 \ 3 = –01 3.3 ..... •Press F 3(Norm) 1 to clear the Sci specifica- tion. COMP Memory Calculations Use the F key to enter the COMP Mode when you want to perform a calculation using memory. COMP .............................................................F 1 k Answer Memory •Whenever you press = after inputting values or an ex- pression, the calculated result automatically updates An- swer Memory c
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k Independent Memory •Values can be input directly into memory, added to memory, or subtracted from memory. Independent memory is convenient for calculating cumulative totals. •Independent memory uses the same memory area as variable M. •To clear independent memory (M), input 0 A j 3. • Example: 23 9 32 23 + 9 A j 3 53 6 47 53 , 6 | ) 45 2 90 45 - 2 A { (Total) –11 0 3 k Variables • There are nine variables (A through F, M, X and Y), which can be used to store data, constants, resul
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Scientific Function COMP Calculations Use the F key to enter the COMP Mode when you want to perform basic arithmetic calculations. COMP .............................................................F 1 • Certain types of calculations may take a long time to complete. •Wait for the result to appear on the display before start- ing the next calculation. • π = 3.14159265359 k Trigonometric/Inverse Trigonometric Functions •To change the default angle unit (degrees, radians, grads), press the F key a
