**Commutative law of addition**

The commutative property of addition is simply the fact that an addition can go both ways: 17 + 15 = 15 + 17, and so on. We can state the commutative law formally by the following generalisation, which is true whatever the numbers *a* and *b.*

*a + b = b + a 5 + 6 = 6 + 5*