Casio RM-9850GA PLUS- User Manual

Calculating on the Casio cfx-9850G Plus

0. START/END/EXIT
Press

AC /ON

1

to start (in RUN mode) and

SHIFT AC

/ON

(i.e. OFF) to turn the calculator off. The

calculator will turn itself off after an inactive period, but nothing is lost when this happens. Just turn it
back on. If at some stage you are stuck, and can’t see how to recover,

EXIT

may allow you to start over.

1. SCREEN CONTRAST
The screen can be adjusted to suit you. Press MENU E (use the

cos

key for E: note the small pink letter

E just above it.) to access the CONTrast area. Use the

and

cursors to select colours or the screen

contrast; press the

and

keys to adjust these. Alternatively, press the

F2

key just below the word

IN

.

A on the screen to initialise all settings. Press MENU 1 to return to RUN mode.

2. SYNTAX

Calculations are performed by constructing an expression, in conventional algebraic syntax, and then
pressing

EXE

. Note that there is no equals key. Brackets are used when necessary. Some examples of

acceptable syntax include the following, each of which is different from the equivalent on most scientific

calculators, but is similar to the way expressions are conventionally written. Try each of these on your
calculator, and observe both the screen display and the final result. It is not necessary to clear with

AC /ON

before each new calculation. Don’t forget to press

EXE

.

EXE

for log

10

2

EXE

for 2(5

2

– 1) (Note multiplication sign is optional)

SHIFT

EXE

for 4

-1

(Note the yellow x

-1

above the

key.)

SHIFT EXP EXE

for 5sin 3

π

(Note multiplication signs are optional)

EXE

for 3

5

EXE

for (-2) – (-3) (Note the use of

and

keys.)

SHIFT

EXE

for 3 (Note the yellow

√

above the

key.)

SHIFT

EXE

for -3 (Note the result is given as a complex number.)

SHIFT

EXE

for e

2

(Note that ^ is not used here.)

Ab/c

+

Ab/c

EXE

for

2/5

+

3/4

F–D F–D

toggles last result between fractions and decimals

3. SET UP
Press

SHIFT MENU

to access the SET UP options. Use the

and

keys for highlighting options and

the function keys (

F1

,

F2

, .. ) to select choices. Note that Angle can be set to degrees, radians or grads.

The format in which numerical results are given is controlled by Display. Press

EXIT

to return.

4. SUCCESSIVE COMMANDS

The screen will allow you to construct lengthy expressions if you want. Chain calculations are also

permitted. The result of the most recent calculation is recorded as Ans. This result is used in chain
calculations. It can also be directly recalled using

. For example, try the following key sequence,

and note carefully the screen and the successive results to see what is happening:

EXE

EXE

EXE

Various constant operations can be performed by taking advantage of the fact that

EXE

repeats the

previous entry. For example, note the effect of the following key sequence:

EXE

EXE EXE EXE

...

© 1998 Barry Kissane, Institute of Education, Murdoch University. All rights reserved.