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