Radio Shack EC-235 User Manual

Ec-235 8-digit pocket calculator, Operation

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OWNER’S MANUAL — Please read before using this equipment.

2000 RadioShack Corporation.

RadioShack and RadioShack.com are trademarks used by RadioShack Corporation.

EC-235 8-Digit Pocket Calculator

Your RadioShack EC-235 8-Digit Pocket Calculator’s compact size
lets you use it almost anywhere.

Percentage Key — simplifies discount, percentage, and tax calcula-
tions.

Square Root Key — quickly computes the square root of the dis-
played number.

Constant Calculations — let you add, subtract, divide, or multiply the
same number over and over without having to re-enter that number.

Large 8-Digit Liquid Crystal Display — makes it easy to read calcu-
lation results.

Protective Wallet — protects the calculator’s keypad.

OPERATION

You can enter basic, mixed, percentage,
add-on, and discount calculations.

Press

ON/C

to turn on your calculator.

If you do not press a key for about 8 minutes,
your calculator automatically turns off. To
turn it off sooner, press

OFF

Correcting Entry Errors

If you enter an incorrect value, press

(Clear Entry)

once. Then enter the correct

value and continue your calculation.

To clear the display for a new calculation,
press

ON/C

(On/Clear) so

appears (this also clears the calculator’s

memory). Then begin the new calculation.

If you press an incorrect operator key (

++++

–

ЧЧЧЧ

чччч

), simply press the cor-

rect key and continue your calculation.

Constant Calculations

For addition, subtraction, and division, the value you enter before
pressing

====

is the constant. For multiplication, the value you enter be-

fore pressing

ЧЧЧЧ

is the constant.

Exponential, Square Root,
and Reciprocal Calculations

Memory Calculations

To store a value in memory, first clear the memory and the display by
pressing

(Memory Recall/Clear) twice, then press

To add a value to memory, enter the number or calculation you want to
add, then press

++++

. The calculator totals the current calculation (if one

is pending) and adds that value to memory.

To subtract a value from memory, enter the number or calculation you
want to subtract, then press

M–

. The calculator totals the current calcu-

lation (if one is pending) and subtracts that value from memory.

To recall the value from memory, press

once.

Calculation Errors

(5525

appears when:

• A calculation result exceeds 8 digits. This is an overflow error (see

“Estimating Calculation Results” ).

• A memory calculation result exceeds 8 digits to the left of the dec-

imal point. The memory contents remain unchanged.

• You try to divide by 0.

• You try to calculate the square root of a negative number.

(5525

appears, press

ON/C

to clear the error.

Estimating Calculation Results

If you perform an operation that results in an overflow error, you can
estimate the correct result (to 8 significant digits) by following these
steps.

1. Count the number of digits 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

(5525

(5525####413475397

413475397

appears, the approximate answer is

101,420,640. If

(5525

(5525#### 64<1:367:

64<1:367:

appears, the approximate answer is

31,970,347,000.

Calculation

You Press

You See

7 + 3

====

5 + 3

====

7 + 3

====

431

260

12.3

====

3198

260

4.15

====

260

ЧЧЧЧ

12.3

====

4.15

====

64<;1

43:<1

Calculation

You Press

You See

= 8

ЧЧЧЧ

= =

The square root of 2 is 1.4142135

417475468

= 0.125

31458

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