I think that I have finally overcome my mental block about this particular problem. It came to me as I was waiting for the bus this morning. Looking at my index card, I can't believe that I never noticed it before.
To find the difference between two numbers:
- If the signs are the same, subtract the numbers.
- If the signs are different, add the numbers.
or
SAME = SUBTRACT ...................... DIFFERENT = ADD
I never noticed the matching letters before!
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