Radio Shack Calculator EC 235 User Guide

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