additive numbers
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The numbers you add together are called addends. If you add one number to another to form a sum, the number you add on can be called the augend. See the Penguin Dictionary of Mathematics.
when you add two or more numbers together, the result is called the sum
The numbers in an addition sum that are added are called the addends.
I don't think you cant sum numbers. You can add numbers to get the sum.
There is no special name.