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Staples SPL-P500 Printing Calculator Questions & Answers
Why doesn't the equal button work when I do additions and subtractions?
Your calculator is fine. It is an adding machine first, so it uses adding machine logic and you hit the star button to print the total on the tape. The equals sign is only used when multiplying and dividing.
Adding machine logic is as follows:
5+ total 5
3- total 2
7+ total 9
* print out total
Good luck,
Paul
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