Addition
The operation is called addition.
The sum.
An additive operation is an operation which produces the sum of two operands.
By adding.
addition
a sum
43. A sum is a binary operation. You have a sum of two things. There is no sense in a sum of one thing.
A sum is an operation involving two or more numbers. You cannot have a sum of a single number.
The answer is called "the sum".
The sum is a binary operation. The first operand is increased by the value of the second.
To find the sum, you perform the operation of addition. This involves combining two or more numbers to obtain a total value. For example, if you want to find the sum of 3 and 5, you would add them together to get 8.
The sum of the measurement of all sides of a non-circular closed-figure gives you it's perimeter.