What is the sum of 4 and 81?

What does it mean when someone asks you for the sum of 4 and 81? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 4 and 81?" they mean that 4 is an addend and 81 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 4 and 81 is the same as 4 plus 81. Here is the addition equation with the answer:

4 + 81 = 85

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