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Casio fx-991ES PLUS User Manual

Casio fx-991ES PLUS
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Important!
Depending on the type of calculation result that is on the display when you press the
key, the conversion process may take some time to perform.
With certain calculation results, pressing the key will not convert the displayed
value.
You cannot switch from decimal form to mixed fraction form if the total number of digits
used in the mixed fraction (including integer, numerator, denominator, and separator
symbols) is greater than 10.
Note
With Natural Display (MathO), inputting one of the following calculations and then
pressing instead of will display the calculation result in decimal form: a
calculation that results in a form or π form expression, a division calculation.
Pressing
after that will switch to the fraction form or π form of the calculation
result. The
form of the result will not appear in this case.
Fraction Calculations
Note that the input method for fractions is different, depending upon
whether you are using Natural Display or Linear Display.
Example 1:
2
3
+
1
2
=
7
6
(MthIO-MathO) 2
3 1 2
7
6
or 2 3 1 2
7
6
(LineIO) 2 3 1 2 7 6
Example 2: 4 - 3
1
2
=
1
2
(MthIO-MathO) 4 ( ) 3 1 2
1
2
(LineIO) 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.
Results of calculations that mix fraction and decimal values are always decimal.
21

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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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