when you add numbers together.
Ex.: 5 + 5 = 10
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Addition works because like all mathmatics as long as you know 1/2 of the equation, answer, and type of equation (addition,subtraction,multiplication, or division) there is only 1 answer.
A product is the answer of a multiplication equation. A sum is the answer of an addition equation.
The summands Also the addends
because you undo the operation in the equation= to undo subtraction you add
x + 2 = 0