Radio Shack 65-789 Owner's Manual download pdf (Page 7)

6

Operation

CORRECTING ERRORS

Correctin

g

Entered Di

g

its

Press →

to delete the last digit you entered.

Repeatedly press

→

to delete all digits from

the display (so

0

reappears).

Correctin

g

Entry Errors

If you enter an incorrect value, press

CE

(clear entry) once. Then enter the correct

value and proceed with your calculation.

Display Errors

E

(error) appears in the lower left corner of

the display when:

• a calculation result exceeds 12 digits.

This is an overflow error (see “Approxi-

mating Overflow Errors”)

• you try to divide by 0

• a memory calculation exceeds 12 digits

(the memory contents remain

unchanged)

Note:

......

is printed above the

overflow-error result when the print

mode is selected.

• Press

C

to clear the error, then try again.

Approximatin

g

Overflow Errors

If your calculation results in a number that

exceeds 12 digits, you can estimate the cor-

rect result, to 12 significant digits.

1. Count the number of digits that appear

to the left of the decimal point.

2. Remove the decimal point.

3. Add as many zeros to the right of the

number as there were digits to the left of

the decimal point.

For example, if

E 2.34567898758

ap-

pears, the approximate answer is

2,345,678,987,580.

CALCULATION EXAMPLES

Before performing each calculation, press

MT

to clear the memory (if necessary) then

C

to clear the last calculation and any dis-

played value.

Addition and Subtraction

Your calculator uses the adding machine en-

try method to do addition and subtraction cal-

culations. To add or subtract, first enter the

value, then press a function key (

+

or –) for

that value.

Example:

12.55

+

15.75

+

4.20 – 10.45 –

5.30 – 3.80 = 12.95

Switch Setup:

P, A, IC+

Constant Addition and

Subtraction

For addition and subtraction, the last value

you enter before pressing + or – is the con-

stant.

Press Display Printout

1255 +

12.55

12.55

+

1575 +

28.30

15.75

+

420 +

32.50

4.20 +

1045 –

22.05

10.45 –

530 –

16.75

5.30 –

◊

/S

005

16.75

16.75

◊

380 –

12.95

3.80 –

/T

006

12.95

12.95

∗

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