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E
fx-115ES PLUS
fx-991ES PLUS C
User’s Guide
CASIO Worldwide Education Website
http://edu.casio.com
CASIO EDUCATIONAL FORUM
http://edu.casio.com/forum/
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Contents Important Information ............................................................. 2 Sample Operations .................................................................. 2 Initializing the Calculator ........................................................ 2 Safety Precautions .................................................................. 2 Handling Precautions .............................................................. 2 Removing the Hard Case ..................................
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Important Information • 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
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• 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. Removing the Hard Case Before using the calculator, slide its hard case downwards to remove it, and then affix the hard case to t
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Reading the Display The display of the calculator shows expressions you input, calculation results, and various indicators. Input expression Indicators Math Math Math Math Calculation result • If a ' indicator appears on the right side of the calculation result, it means the displayed calculation result continues to the right. Use e and d to scroll the calculation result display. • If a g indicator appears on the right side of the input expression, it means the displayed calculation continue
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The display currently shows an intermediate result of a Disp multi-statement calculation. Important: For some type of calculation that takes a long time to execute, the display may show only the above indicators (without any value) while it performs the calculation internally. Using Menus Some of the calculator’s operations are performed using menus. Pressing N or w, for example, will display a menu of applicable functions. The following are the operations you should use to navigate between
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1MthIO 2LineIO Specifies the display format. Math Math Natural Display (MthIO) causes fractions, irrational numbers, and other expressions to be displayed as they are written on paper. MthIO: Selects MathO or LineO. MathO displays input and calculation results using the same format as they are written on paper. LineO displays input the same way as MathO, but calculation results are displayed in linear format. Linear Display (LineIO) causes fractions and other expressions to be disp
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c6Rdec 1ON ; 2OFF Specifies whether or not to display calculation results using recurring decimal form. c7Disp 1Dot ; 2Comma Specifies whether to display a dot or a comma for the calculation result decimal point. A dot is always displayed during input. Note: When dot is selected as the decimal point, the separator for multiple results is a comma (,). When comma is selected, the separator is a semicolon (;). c8]CONT' Adjusts display contrast. See “Adjusting Display Contrast”
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e while the cursor is at the end of the input calculation will cause it to jump to the beginning, while pressing d while the cursor is at the beginning will cause it to jump to the end. • You can input up to 99 bytes for a calculation. Each numeral, symbol, or function normally uses one byte. Some functions require three to 13 bytes. • The cursor will change shape to k when there are 10 bytes or less of allowed input remaining. If this happens, end calculation input and then press =. Ca
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Important: • Certain types of expressions can cause the height of a calculation formula to be greater than one display line. The maximum allowable height of a calculation formula is two display screens (31 dots × 2). Further input will become impossible if the height of the calculation you are inputting exceeds the allowable limit. • Nesting of functions and parentheses is allowed. Further input will become impossible if you nest too many functions and/or parentheses. If this happens, di
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To insert a character or function into a calculation: Use d and e to move the cursor to the location where you want to insert the character or function and then input it. Be sure always to use the insert mode if Linear Display is selected. To clear all of the calculation you are inputting: Press A. Recurring Decimal Calculations Your calculator uses a recurring decimal when you input a value. Calculation results also can be displayed using recurring decimal form whenever applicable. Inpu
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Note: • You can specify up to 14 decimal places for the recurring decimal period. If you input more than 14 decimal places, the value will be treated as a terminating decimal and not a recurring decimal. • Recurring decimal value input can be performed regardless of the Rdec setting on the setup menu. Displaying a Calculation Result as a Recurring Decimal Value Calculation results that can be displayed as recurring decimal values will be displayed as such when ON is selected for the Rdec
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Math Math Return to initial display format (Norm 1): f 1 = 0.142857 = 0.1428571429 (Norm 1) b 7 1 ' 7 = Display as recurring decimal: f Decimal value according to Norm 1 setting: f Return to initial display format (fraction): f 1 1 ÷ 7 = 0.1428571429 (Norm 1) = 0.142857 = b 7 1 / 7 = Display as fraction: f Display as recurring decimal: f Return to initial display format (Norm 1): f Conditions for Displaying a Calculation Result as a Recurring Decimal If a calculatio
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• The data size of value to be displayed as the recurring decimal must be no larger than 99 bytes. Each value and the decimal point require one byte, and each digit of the period requires one byte. The following, for example, would require of total of 8 bytes (4 bytes for the values, 1 byte for the decimal point, 3 bytes for the period): 0.123 Note: For information about switching the display format of a calculation result when OFF is selected for the Rdec setting on the setup menu, see “
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Toggling Calculation Results While Natural Display is selected, each press of f will toggle the currently displayed calculation result between its fraction form and decimal form, its ' form and decimal form, or its π form and decimal form. 1 π ÷ 6 = = 0.5235987756 B π 6 1 f 15(π)/ 6 = 0.5235987756 π 6 ( + 2) × = = 5.913591358 B ' 2 ' 3 ' 6 + 2' 3 f (! 2 e+ 2 )*! 3 = ' ' ' 5.913591358 6 + 2 3 While Linear Display is selected, each press of f will toggle the currently displa
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1 1 1 = B 4 -1'(() 3 e 1 c 2 = 4 − 3 2 2 2 b 4 - 3 ' 1 ' 2 = 1{2 Note: • Mixing fractions and decimal values in a calculation while Linear Display is selected 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 form: Perform the following key operation: 1f( ) < To switch a calculation result between fractio
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Multi-Statements 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 S7(:) 3 * 3 = 6 = 9 Using Engineering Notation 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 = 1234 3 W 1.234×10 0 W 1234×10 Transform the value 123 to engineering notat
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Answer Memory (Ans) /Previous Answer Memory (PreAns) The last calculation result obtained is stored in Ans (answer) memory. The calculation result obtained prior to the last one is stored in PreAns (previous answer) memory. Displaying the result of a new calculation will move current Ans memory contents to PreAns memory and store the new calculation results in Ans memory. PreAns memory can be used only in the COMP Mode. PreAns memory contents are cleared whenever the calculator enters an
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Variables (A, B, C, D, E, F, X, Y) Your calculator has eight preset variables named A, B, C, D, E, F, X, and Y. You can assign values to variables and also use the variables in calculations. To assign the result of 3 + 5 to variable A 3 + 5 1t(STO)y(A) 8 To multiply the contents of variable A by 10 (Continuing) Sy(A)* 10 = 80 To recall the contents of variable A (Continuing) ty(A) 8 To clear the contents of variable A
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Note: • Only the quotient value of a ÷R calculation is stored in Ans memory. • Assigning the result of a remainder division calculation to a variable will assign the quotient value only. Performing the operation 5 a ' (÷R) 2 !t(STO))(X) (which assigns the result of 5÷R2 to X) will assign a value of 2 to X. • If a ÷R calculation is part of a multi-step calculation, only the quotient is passed on to the next operation. (Example: 10 + 17 a'(÷R) 6 = → 10 + 2) • Operation of the f and e keys
