What is the sum of 7 and 78?

What does it mean when someone asks you for the sum of 7 and 78? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 7 and 78?" they mean that 7 is an addend and 78 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 7 and 78 is the same as 7 plus 78. Here is the addition equation with the answer:

7 + 78 = 85

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