
What does it mean when someone asks you for the sum of 18 and 21? The sum is part of the addition equation displayed below.
addend + addend = sum
When someone asks "What is the sum of 18 and 21?" they mean that 18 is an addend and 21 is an addend in an addition equation.
Therefore, as you may have inferred, the sum of 18 and 21 is the same as 18 plus 21. Here is the addition equation with the answer:
18 + 21 = 39
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What is the sum of 18 and 22?
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