Question

What property describes the number sentence 6+0 = 6

Answer 1

That is the Identity Property of Addition.
If it is adding and the whole number stays the same it is Identity Property of Addition.
If it is multiplying then it would be the Identity Property of Multipulcation. For example for this problem it would be 6x1 in multipulcation in which the whole number would stay the same.
Here are descriptions of all the properties:
https://wikis.engrade.com/mathproperties1

Answer 2

The number sentence 6+0=6  is an example of Additive Identity Property of Addition.
telling us that any number added to zero is that number itself  i.e., 6 added to zero is still 6.....

Hope it helps !!!