What does it mean when someone asks you for the sum of 4 and 5? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 4 and 5?" they mean that 4 is an addend and 5 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 4 and 5 is the same as 4 plus 5. Here is the addition equation with the answer:

4 + 5 = 9

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