Calculation Function; Manual Calculation Preparations; Manual Calculation Input And Correction - Casio FX-890P Owner's Manual

3 Calculation Function

This section covers fundamental arithmetic calculations and function calculations,
which are performed manually.

3.1 Manual Calculation Preparations

Switch the power of the unit ON
The display illustrated above appears whenever the power is switched ON. It
indicates the CAL mode in which manual calculations can be performed. Currently
specified angle units, however, is retained even when the power is switched OFF.

3.2 Manual Calculation Input and Correction

Perform the following fundamental calculations to become familiar with this mode.
EXAMPLE:
123 + 456 = 579
123 + 456
. .
As can be seen here, the .
multiplication and / is used for division.
The following procedure can be used to correct entered data.
EXAMPLE:
33 x 5 + 16 = 181
For the sake of example, the value 33 here will be mistakenly entered as 34.
34 * 5 + 16
Press  six times to move cursor back to position of 4. This can also be
accomplished by Shift L.TOP
.    
3.
. .
CAPS .
_
S .
BASIC .
DEG .
RAD .
GRA .
123+456_
123+456
. key is pressed in place of = . The * key is used for
34*5+16_
.
.
34*5+16
33*5+16
33*5+16
(Formula input)
(Obtains result)
579
(Replaces 4 with 3)
181
18