CK-12 are collecting together free open source, crowd sourced online textbooks, so that you can do away with the textbook publishers. The real value of this resource is found when you do a search. You can find textbook 'chapters' which you can combine together into a unique textbook for your class.I am currently working on Factorising Quadratic Trinomials with my Year 9 class. A quick search for "Factoring Trinomials" revealed this chapter that although I wouldn't use it as my textbook chapter, it did have some excellent questions and answers.
More free textbooks can be found here at http://e-booksdirectory.com/
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