Casio fx-991ES PLUS User Manual

Technical Information
Errors
The calculator will display an error message whenever an error occurs for
any reason during a calculation.
There are two ways to exit an error message display: Pressing
or
to display the location of the error, or pressing to clear the message
and calculation.
Displaying the Location of an Error
While an error message is displayed, press or to return to the
calculation screen. The cursor will be positioned at the location where the
error occurred, ready for input. Make the necessary corrections to the
calculation and execute it again.
Example: When you input 14 ÷ 0 × 2 by mistake instead of 14 ÷ 10 ×
2 (MthIO-MathO)
14 0 2
(or )
1
Clearing the Error Message
While an error message is displayed, press
to return to the calculation
screen. Note that this also clears the calculation that contained the error.
Error Messages
Math ERROR
Cause:
•
The intermediate or final result of the calculation you are performing
exceeds the allowable calculation range.
71

Casio fx-991ES PLUS Specifications

General

Type	Scientific
Cover	No
Form factor	Desktop
Control type	Buttons
Product color	Gray
Digits	15 digits
Display type	Dot-matrix
Display resolution	96 x 31 pixels
Display number of lines	10 lines
Storage media type	Not available
Battery life	3 year(s)
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Symbolic notation	Square root
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	162 mm
Width	80 mm
Height	11.1 mm
Weight	95 g