An operation in which any pair \((a, b)\) of real numbers is made to correspond to a real number written \((a + b)\) called the sum of

*a*and

*b*.

The addition of real numbers is one of the operations in arithmetic.

We add one number to another, one quantity to another, one value to another.

### Examples

- 12 + 27 = 39
- -0.45 + 3.271 = 2.821