What is the sum of 9 and 99?

What does it mean when someone asks you for the sum of 9 and 99? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 9 and 99?" they mean that 9 is an addend and 99 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 9 and 99 is the same as 9 plus 99. Here is the addition equation with the answer:

9 + 99 = 108

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