Combining Like Terms

This topic is another side topic, which after being taught is combined into solving even larger equations. In an equation generally combining like terms happens after distributive property (if it is present). Students also seem to get these rules confused with distributive property since they are taught near each other. But you must remember distributive property deals with multiplication and combining like terms deals with adding.

Videos:
http://www.khanacademy.org/math/algebra/introduction-to-algebra/manipulating-expressions/v/combining-like-terms

http://www.khanacademy.org/math/algebra/introduction-to-algebra/manipulating-expressions/v/adding-like-rational-terms

http://www.khanacademy.org/math/algebra/introduction-to-algebra/manipulating-expressions/v/combining-like-terms-1

http://www.khanacademy.org/math/algebra/introduction-to-algebra/manipulating-expressions/v/combining-like-terms-2

http://www.khanacademy.org/math/algebra/introduction-to-algebra/manipulating-expressions/v/combining-like-terms-3

Practice:
http://www.khanacademy.org/math/algebra/introduction-to-algebra/manipulating-expressions/e/combining_like_terms_1

http://www.saddleback.edu/faculty/lperez/algebra2go/prealgebra/variables/combLikeTerms.html

http://www.purplemath.com/modules/polydefs2.htm

IXL
http://www.ixl.com/math/grade-8
Scroll down to sections T.6 T.7 and U.8