addend
An addend is a number or quantity to be added to another.
Another number added to a number is the sum (total) of the two numbers.
A number being added to another number is called an addend. The total of the numbers added together is called the sum.
Another number added to a number is the sum (total) of the two numbers.
Addend is the number being added to another number in an addition problem to derive a sum.
There is a complement that when added equals one but you may be thinking of multiplying. A number times its reciprocal (multiplicative inverse) is equal to one. A number added to its additive inverse (opposite) is equal to zero.
addition a number
5+x is 5 added to another number.
An addend
Addition.
Addend
When you add a number to another number the result is their sum