CK-12.ORG: Online Textbooks

Have you seen customizable, free, curriculum-aligned content for K-12? 


CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-content, web-based collaborative model termed the "FlexBook," CK-12 intends to pioneer the generation and distribution of high quality educational content that will serve both as core text as well as provide an adaptive environment for learning through the FlexBook Platform™.


New content from CK-12:
New contributions from our users:
Study Guides from CK-12 High School interns:

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