Casio fx-991ES (Natural Display). Image: Wikimedia CC BY-SA 3.0 The Casio fx-991ES is a scientific calculator with 8 digits precision and formula input logic. It has 403 functions, 50 keys, and an LCD (liquid crystal) display. The power source is Solar. The calculator was manufactured in China. Casio 991es Plus• PLUS fx-991ES PLUS User’s Guide CASIO Worldwide Education Website CASIO EDUCATIONAL FORUM • Scientific Constants. 35 Metric Conversion. Linkin park in the end. 37 Calculation Ranges, Number of Digits, and Precision. 40 Before Assuming Malfunction of the Calculator.41 Replacing the Battery. 42 Specifications. 42 Frequently Asked Questions. • • 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. • • 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. • There is a value stored in independent memory. ![]() The calculator is standing by for input of a variable name to assign a value to the variable. This indicator appears after you press The calculator is standing by for input of a variable name to recall the variable’s value. • (without any value) while it performs the calculation internally. Using Menus Some of the calculator’s operations are performed using menus. Pressing, for example, will display a menu of applicable functions. The following are the operations you should use to navigate between menus. • Note: • The calculator switches to Linear Display automatically whenever you enter the STAT, BASE-N, MATRIX, or VECTOR Mode. • In this manual, symbol next to a sample operation indicates Natural Display, while symbol indicates Linear Display. • Initializing Calculator Settings 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. (CLR) (Setup) Inputting Expressions and Values Basic Input Rules Calculations can be input in the same form as they are written. • Parenthetical expressions Functions that require an argument to the right and a closing parenthesis “)” following the argument. Functions that come after the input value ( ), powers ( Fractions Negative sign (–), base- Note: When squaring a negative value (such as –2), the value being squared must be enclosed in parentheses ( ). • Using Values and Expressions as Arguments (Natural Display only) A value or an expression that you have already input can be used as the argument of a function. After you have input it the argument of To input 1 + 7 As shown above, the value or expression to the right of the cursor after (INS) are pressed becomes the argument of the function that is specified next. • ÷ 6 = 1 = 0. ( ' 2 + 2) ' 3 = ' 6 + 2 ' 3 = 5.913591358 While Linear Display is selected, each press of displayed calculation result between its decimal form and fraction form.
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