User manual CASIO FX-820MS

[. . . ] E fx-820MS User's Guide http://world. casio. com/edu_e/ CASIO ELECTRONICS CO. , LTD. Unit 6, 1000 North Circular Road, London NW2 7JD, U. K. E-1 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. · Never charge batteries, try to take batteries apart, or allow batteries to become shorted. [. . . ] This is because the calculation performed when v is pressed stores a result to Answer Memory before the , key is pressed. · Example 6: If 300 grams are added to a test sample originally weighing 500 grams, what is the percentage (160%) increase in weight?300 + 500 A v · Example 7: What is the percentage change when a value is increased from 40 to 46?(15%, 20%) 46 , 40 A v eeeee e8= p q - 20 A v , * k Degrees, Minutes, Seconds Calculations · You can perform sexagesimal calculations using degrees (hours), minutes, and seconds, and convert between sexagesimal and decimal values. · Example 1: To convert the decimal value 2. 258 to a sexagesimal value and then back to a decimal value 2. 258 = 2. 258 2°15°28. 8 2. 258 AO I E-14 · Example 2: To perform the following calculation: 12°34'56" 3. 45 12 I 34 I 56 I - 3. 45 = 43°24°31. 2 k FIX, SCI, RND · To change the settings for the number of decimal places, the number of significant digits, or the exponential display format, press the F key a number of times until you reach the setup screen shown below. F i x Sc i No r 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 of significant digits 3 (Norm): Exponential display format · Example 1: 200 Ö 7 14 200 \ 7 - 14 = (Specifies three decimal places. ) 400. 00 FIX F. . . . . 1(Fix) 3 200 \ 7 = 400. 00000 28. 57100 400. 00000 (Internal calculation continues using 12 digits. ) - 14 = The following performs the same calculation using the specified number of decimal places. 200 \ 7 = (Internal rounding) 28. 57100 28. 57100 399. 994 00 AQ - 14 = · Press F . . . . . 3(Norm) 1 to clear the Fix specification. E-15 · Example 2: 1 Ö 3, displaying result with two significant digits (Sci 2) F . . . . . 3(Norm) 1 to clear the Sci specification. Memory Calculations COMP Use the F key to enter the COMP Mode when you want to perform a calculation using memory. F 1 k Answer Memory · Whenever you press = after inputting values or an expression, the calculated result automatically updates Answer Memory contents by storing the result. · In addition to =, Answer Memory contents are also updated with result whenever you press A v, |, A {, or A j followed by a letter (A through F, or M, X, or Y). · Answer Memory can store up to 12 digits for the mantissa and two digits for the exponent. · Answer Memory contents are not updated if the operation performed by any of the above key operations results in an error. k Consecutive Calculations · You can use the calculation result that is currently on the display (and also stored in Answer Memory) as the first value of your next calculation. Note that pressing an operator key while a result is displayed causes the displayed value to change to Ans, indicating it is the value that is currently stored in Answer Memory. · The result of a calculation can also be used with a subsequent Type A function (x2, x3 , x­1 , x!, DRG'), +, ­, ^(xy), x , , Ö, nPr and nCr. E-16 k Independent Memory · Values can be input directly into memory, added to memor y, or subtracted from memory. · Example: 23 53 ) 45 9 6 2 32 47 90 ­11 23 + 9 A j 3 53 , 6 | 45 - 2 A { (Total) 03 k Variables · There are nine variables (A through F, M, X and Y), which can be used to store data, constants, results, and other values. · Use the following operation to delete data assigned to a particular variable: 0 A j 1. · Perform the following key operation when you want to clear the values assigned to all of the variables. A B 1(Mcl) = · Example: 193. 2 Ö 23 193. 2 Ö 28 8. 4 6. 9 193. 2 A j 1 \ 23 = p 1 \ 28 = E-17 Scientific Function Calculations COMP Use the F key to enter the COMP Mode when you want to perform basic arithmetic calculations. F 1 · Certain types of calculations may take a long time to complete. · Wait for the result to appear on the display before starting the next calculation. · = 3. 14159265359 k Trigonometric/Inverse Trigonometric Functions · To change the default angle unit (degrees, radians, grads), press the F key a number of times until you reach the angle unit setup screen shown below. Deg Rad G r a 1 2 3 · Press the number key (1, 2, or 3 ) that corresponds to the angle unit you want to use. [. . . ] Pay special attention to values in any memory areas you are using. Stack ERROR · Cause · The capacity of the numeric stack or operator stack is exceeded. · Divide your calculation into two or more separate parts. Syntax ERROR · Cause · An attempt to perform an illegal mathematical operation. · Action · Press e or r to display the calculation with the cursor located at the location of the error and make required corrections. Arg ERROR · Cause · Improper use of an argument · Action · Press e or r to display the location of the cause of the error and make required corrections. E-29 k Order of Operations Calculations are performed in the following order of precedence. 1 Coordinate transformation: Pol (x, y), Rec (r, ) 2 Type A functions: With these functions, the value is entered and then the function key is pressed. [. . . ]