What is the sum of 12 and 99?

What does it mean when someone asks you for the sum of 12 and 99? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 12 and 99?" they mean that 12 is an addend and 99 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 12 and 99 is the same as 12 plus 99. Here is the addition equation with the answer:

12 + 99 = 111

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