If both numbers are positive, simply add them as you learned in 4th grade.
If both numbers are negative,simply add them but add a minus to the answer.
If one is positive and the other negative, ignoring the signs,subtract the smaller from the larger and add the sign of the larger to your answer.
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the difference
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I believe it is called the answer. Or sum When you add it is called the sum. When you subtract it is called the difference
When you subtract one number from another you get the difference.You just said it; sum.
The same way you would add or subtract whole numbers, leaving the denominators alone.