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"E" indicates an error condition. This is generally caused by attempting a calculation out of the calculators possible range of answers, or by static electricity altering the memory contents. Try the AC (all clear) button, power on/off, removing and re-installing all batteries, using a straightened paper clip to depress the reset button (usually on the back of the calculator)

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Q: What do i do when E is showing on my casio calculator?
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