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http://www.khanacademy.org/
I recommend this website because it has what we all need help on.You search distributive property then it goes to all the properties that we need.
http://www.mathwarehouse.com/properties/associative-distributive-and-commutative-properties.php
This website is good because it explains what we have to do and if you don't know how to do something it follows you threw it slowly.