Let's say we have the addition problem 1 + 2 = 3
1 and 2 are the addends. 3 is the sum.
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Addends
The summands.
addend+addend=sum
The numbers being added are called the addends. The answer to the problem is called sum.
The commutative property of addition is a fact that proves an answer is the same even if you switch the 2 numbers in the addition problem around. This only works with addition.