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Your RadioShack EC-235 8-Digit Pocket Calculator’s compact size lets you use it almost anywhere. Percentage Key — simplifies discount, percentage, and tax calculations. Square Root Key — quickly computes the square root of the displayed 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 calculation 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 CE (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 0. 31313131#appears (this also clears the calculator’s memory). Then begin the new calculation. If you press an incorrect operator key (+ ++++, –, . .... , . .... ), simply press the correct 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 before pressing . .... is the constant. Calculation You Press You See 7 + 3 = ==== 10 5 + 3 = ==== 8 7 + 3 = ==== 5 = ==== 10. 431431431431# 8. ;1;1;1;1# 260 . 12.3 = ==== 3198 260 . 4.15 = ==== 260 . .... 12.3 = ==== 4.15 = ==== 3198. 64<;164<;164<;164<;1# 107 43:43:43:43: 9 <<<< . 1111# Exponential, Square Root, and Reciprocal Calculations Calculation You Press You See 23 = 8 2 . .... = = 8. ;1;1;1;1 The square root of 2 is 1.4142135 2 1 4444 . 1111 41 74747474 42 75757575 1 4444 3 6666 5 8888# 1/8 = 0.125 8 . .... = 0. 31313131 1 4444 2 5555 5 8888# Memory Calculations To store a value in memory, first clear the memory and the display by pressing MCR (Memory Recall/Clear) twice, then press CE. 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. To subtract a value from memory, enter the number or calculation you want to subtract, then press M–. The calculator totals the current calculation (if one is pending) and subtracts that value from memory. To recall the value from memory, press MCR once. Calculation Errors ERR (55(55(55(55O 2222R 5555 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 decimal point. The memory contents remain unchanged. • You try to divide by 0. • You try to calculate the square root of a negative number. If ERR (55(55(55(55O 2222R 5555appears, 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 ERR (55(55(55(55O 2222R 555513 1 4444. 11101 43433444206 75397539753975394 7777#appears, the approximate answer is 101,420,640. If ERR (55(55(55(55O 2222R 5555#64 319 <64<6464<<. 11117 ::::0 33333 66664 77777 ::::#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. CARE Keep the calculator dry; if it gets wet, wipe it dry immediately. Use and store the calculator only in normal temperature environments. Handle the calculator carefully; do not drop it. Keep the calculator away from dust and dirt, and wipe it with a damp cloth occasionally to keep it looking new. Modifying or tampering with the calculator’s internal components can cause a malfunction and might invalidate its warranty. If your calculator is not performing as it should, take it to your local RadioShack store for assistance. Replacing the Battery If the display dims or the calculator speed slows down, replace the battery with a 389A type button-cell battery. For the best performance and longest life, we recommend RadioShack alkaline batteries. Warning: Keep button-cell batteries away from children. Swallowing a button-cell battery can be fatal. Cautions: • Use only a fresh battery of the required size and type. • Always remove an old or weak battery. Batteries can leak chemicals that can destroy electronic parts. • Dispose of the old battery promptly and properly. Do not burn or bury it. 1. Using a Phillips screwdriver, remove the four screws on the back cover of the calculator. 2. To separate the front and back cover halve...