What is the sum of 5 and 4?

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

addend + addend = sum

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

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

5 + 4 = 9

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