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Casio fx-991ES PLUS User Manual

Casio fx-991ES PLUS
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Basic Calculations
Use the
key to enter the COMP Mode when you want to perform
basic calculations.
(COMP)
Toggling Calculation Results
While Natural Display is selected, each press of
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.
Example 1: π ÷ 6 =
1
6
π = 0.5235987756 (MthIO-MathO)
(π)
6
1
6
π 0.5235987756
Example 2: (√2 + 2) × 3 = 6 + 2√3 = 5.913591358 (MthIO-MathO)
2 2 3
6 + 2√3 5.913591358
While Linear Display is selected, each press of will toggle the
currently displayed calculation result between its decimal form and fraction
form.
Example 3: 1 ÷ 5 = 0.2 =
1
5
(LineIO)
1 5
0.2 1 5
Example 4: 1 -
4
5
=
1
5
= 0.2 (LineIO)
1 4 5
1 5 0.2
20

Table of Contents

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Casio fx-991ES PLUS Specifications

General IconGeneral
TypeScientific
CoverNo
Form factorDesktop
Control typeButtons
Product colorGray
Digits15 digits
Display typeDot-matrix
Display resolution96 x 31 pixels
Display number of lines10 lines
Storage media typeNot available
Battery life3 year(s)
Battery typeLR44
Power sourceBattery/Solar
Number of batteries supported1
Symbolic notationSquare root
Conversion betweenDecimal, Fraction, Percent
Convert angles from degrees toGradian, Radian
Random number/integer generatorYes
Weight and Dimensions IconWeight and Dimensions
Depth162 mm
Width80 mm
Height11.1 mm
Weight95 g

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