The numbers to be added are called addends. The answer is called the sum.
Addends
The numbers being added are called the addends. The answer to the problem is called sum.
Numbers that are added are called addends or terms.
In 1 + 2 = 31 and 2 are the addends and 3 is the sum of the two addends.
The answer to an addition problem is called the sum.
Addend plus addend equals sum.
A number involved in an addition problem; numbers being added are called addends.
That would be an addition problem such as 2+3=5 5 would be the sum.
addition
Addend.
Addends
Addition.