What is the sum of 59 and 64?

What does it mean when someone asks you for the sum of 59 and 64? The sum is part of the addition equation displayed below.

addend + addend = sum

When someone asks "What is the sum of 59 and 64?" they mean that 59 is an addend and 64 is an addend in an addition equation.

Therefore, as you may have inferred, the sum of 59 and 64 is the same as 59 plus 64. Here is the addition equation with the answer:

59 + 64 = 123

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