Khan Academy
Khan Academy: Arithmetic Properties: Inverse Property of Addition
This video demonstrates the simple idea that a number plus its negative is 0.
Khan Academy
Khan Academy: Arithmetic Properties: Associative Law of Addition
This video explains the associative law of addition by writing an expression in a different ways.
Khan Academy
Khan Academy: Arithmetic Properties: Identity Property of 0
This video explains the identity property of zero by substituting values into an expression.
Khan Academy
Khan Academy: Arithmetic Properties: Commutative Property for Addition
This video shows how to write an equivalent numerical expression using the associative and commutative properties of addition. [3:22]
Khan Academy
Khan Academy: Arithmetic Properties: Commutative Law of Multiplication
Commutative Law of Multiplication is presented with an example in this video.
Khan Academy
Khan Academy: Arithmetic Properties: Commutative Law of Addition
This video explains the commutative law of addition. Practice problems are available. [1:40]
Khan Academy
Khan Academy: Arithmetic Properties: Inverse Property of Multiplication
Simple idea that multiplying by a numbers multiplicative inverse gets you back to one