Any
+++
Strictly speaking, it is ADD.
The word 'sum' is used colloquially for any simple arithmetical calculation, but in mathematics a 'sum' is properly the result of adding two or more numbers.
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You work it out on paper or just use a calculator
Your sum is incorrect. Let me sum up.
one has ' prime cost' in front of the word 'sum' and the other has the word 'provisional' in front of 'sum'
addition - subtaction sum - minus I think the word you are looking for is "difference." How about Delta?