EC-235 8-Digit Pocket Calculator
OWNER’S MANUAL — Please read before using this equipment.
Your RadioShack EC-235 8-Digit Pocket Calculator’s compact size
lets you use it almost anywhere.
Exponential, Square Root,
and Reciprocal Calculations
Percentage Key — simplifies discount, percentage, and tax calcula-
tions.
Calculation
23 = 8
You Press
2 × = =
2
You See
;1
Square Root Key — quickly computes the square root of the dis-
played number.
The square root of 2 is 1.4142135
1/8 = 0.125
417475468
31458
8 ÷ =
Constant Calculations — let you add, subtract, divide, or multiply the
same number over and over without having to re-enter that number.
Memory Calculations
Large 8-Digit Liquid Crystal Display — makes it easy to read calcu-
lation results.
To store a value in memory, first clear the memory and the display by
MR
pressing
(Memory Recall/Clear) twice, then press CE.
C
Protective Wallet — protects the calculator’s keypad.
To add a value to memory, enter the number or calculation you want to
add, then press M+. The calculator totals the current calculation (if one
is pending) and adds that value to memory.
OPERATION
You can enter basic, mixed, percentage,
add-on, and discount calculations.
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.
Press ON/C to turn on your calculator.
MR
To recall the value from memory, press
once.
C
If you do not press a key for about 8 minutes,
your calculator automatically turns off. To
turn it off sooner, press OFF.
Calculation Errors
appears when:
(5525
Correcting Entry Errors
• A calculation result exceeds 8 digits. This is an overflow error (see
“Estimating Calculation Results” ).
If you enter an incorrect value, press CE
(Clear Entry) once. Then enter the correct
value and continue your calculation.
• A memory calculation result exceeds 8 digits to the left of the dec-
imal point. The memory contents remain unchanged.
To clear the display for a new calculation,
press ON/C (On/Clear) so 31 appears (this also clears the calculator’s
memory). Then begin the new calculation.
• You try to divide by 0.
• You try to calculate the square root of a negative number.
If you press an incorrect operator key (+, –, ×, ÷), simply press the cor-
rect key and continue your calculation.
If (5525 appears, press ON/C to clear the error.
Constant Calculations
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.
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.
1. Count the number of digits to the left of the decimal point.
2. Remove the decimal point.
Calculation
You Press
You See
7 + 3 = 10
5 + 3 = 8
+
431
;1
7
3 =
5 =
3. Add as many zeros to the right of the number as there were digits
to the left of the decimal point.
260 × 12.3 = 3198
260 × 4.15 =
64<;1
43:<1
260 × 12.3 =
4.15 =
For example, if (5525#413475397 appears, the approximate answer is
101,420,640. If (5525#64<1:367: appears, the approximate answer is
31,970,347,000.
© 2000 RadioShack Corporation.
All Rights Reserved.
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