What is the sum of 9 and 98?

What does it mean when someone asks you for the sum of 9 and 98? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 9 and 98?" they mean that 9 is an addend and 98 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 9 and 98 is the same as 9 plus 98. Here is the addition equation with the answer:

9 + 98 = 107

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What is the sum of 9 and 99?
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