When you add a number to another number the result is their sum
It is called the digit.
That would be an addition problem such as 2+3=5 5 would be the sum.
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.
It is called a sum or an equation
you call is the sum
It is called the sum