**Subtract real numbers**

** **

** **Recall that the answer to a subtraction problem is called the **difference. **Thus, the difference between 6 and 4 is 2. To see how subtraction should be defined, compare the following

two statements.

6 – 4 = 2

6 + (-4) = 2

**Subtraction**

** **

For all real numbers *a *and *b*,

* a – b = a + (-b).*

In words, change the sign of the second number (subtrahend) and add.