The expected answer is probably difference, whereas it should be "ordered difference".
This is because addition is commutative but subtraction is not. That is to say, addition of 3 and 4 gives the answer 7, whether it is calculated as 3 + 4 or as 4 + 3.
However,
the result of subtraction of 3 and 4 depends on whether you calculate 3 - 4 (= -1) or 4 - 3 (= 1). The difference, in either case is 1 but the ordered difference is the figure in the bracket.
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It is the difference
sum is addition difference is subtraction
for addition you take the sum and subtract one of the numbers being added from it and for subtraction you add the difference with the second number being subtracted so it equals the first number
addition-sum subtraction-difference division-quotient multiplication-product
addition and subtraction