What is the sum of 12 and 21?

What does it mean when someone asks you for the sum of 12 and 21? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 12 and 21?" they mean that 12 is an addend and 21 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 12 and 21 is the same as 12 plus 21. Here is the addition equation with the answer:

12 + 21 = 33

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