Augend is the amount that you start off with, addend is what you add to it and sum is the result. Augend comes from the Latin augendum, a thing to be increased. Addend comes from the Latin word addendum which is an addition made to something.

What is a Augend?

: the quantity to which an addend is added.

What is an example of Augend?

Augend meaning

(arithmetic) A quantity to which another is added. In "4 + 5", 4 is the augend. noun.