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Question Mark TOWER Mystery 6  What are the “AC” and “M+” buttons for?
The calculator buttons with letters on them are not used as often as the other keys. But if you knew what they were used for, you could solve problems faster and easier.

For example, AC is the “all clear” key, which erases all results from the calculator’s memory. M+ adds the number or result that is currently displayed on the LCD to the result of the calculation so far.
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