Radio Shack EC-235 Owner's Manual

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 to turn on your calculator.
ON/C
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,
31 31 31 31
press (On/Clear) so
ON/C
memory). Then begin the new calculation.
If you press an incorrect operator key ( ,
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 is the constant.
Calculation
7 + 3 10
5 + 3 8
260 12.3 3198
260 4.15
CE
appears (this also clears the calculator's
, , ), simply press the cor-
–
You Press You See
7 + 3
5
64<;1 64<;1 64<;1 64<;1
260 12.3
43:<1 43:<1
43:<1 43:<1
4.15
Exponential, Square Root,
and Reciprocal Calculations
The square root of 2 is 1.4142135
Memory Calculations
To store a value in memory, first clear the memory and the display by
R
pressing
M
C
To add a value to memory, enter the number or calculation you want to
add, then press
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
lation (if one is pending) and subtracts that value from memory.
To recall the value from memory, press
Calculation Errors
(5525 (5525 (5525 (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 (5525 (5525 (5525
If appears, press
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.
431 431 431 431
;1 ;1 ;1 ;1
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
101,420,640. If
31,970,347,000.
©
2000 RadioShack Corporation.
RadioShack and RadioShack.com are trademarks used by RadioShack Corporation.
OWNER'S MANUAL — Please read before using this equipment.
Calculation
3
2 = 8
1
/ = 0.125
8
(Memory Recall/Clear) twice, then press
. The calculator totals the current calculation (if one
M
. The calculator totals the current calcu-
M–
to clear the error.
ON/C
(5525# # # # 413475397 (5525 413475397
(5525 (5525 413475397 413475397
appears, the approximate answer is
(5525# # # # 64<1:367: (5525 64<1:367:
(5525 (5525 64<1:367: 64<1:367:
appears, the approximate answer is
All Rights Reserved.
You Press You See
;1 ;1 ;1 ;1
2 = =
417475468 417475468 417475468 417475468
2
31458 31458 31458 31458
8 =
.
CE
R
M once.
C