It is called an addend
This is called addition.
Addend
addends
They're are called addends
It is the "additive identity".
sum= answer of an addition question.. so the number of the sum is the answer.
zero property of addition! =D
A number close to an exact number is called an estimate or a ballpark figure.
The numbers to be added are called addends. The answer is called the sum.
This action is called DIVISION. The opposite of this, continuous addition is MULTIPLICATION.
Numbers that are added are called addends or terms.
A number being multiplied is the "multiplicand"; the number doing the multiplying is the "multiplier", and the answer is called the, "product".