Khan Academy Static

In this topic we will understand the properties of addition and subtraction of integers, like Commutative Law of Addition, which says that the two numbers can be added in any order--but this does not hold true for subtraction. Apart from this, we will study various other properties like Commutative Property, Associative Law, and that subtracting a negative is equivalent to adding a positive.

8317_Associative_law_of_addition.html

8318_Identity_property_of_0.html