Use of the CK-12 FlexBook System and FlexBooks are subject to our Creative Commons License.
Traditional textbooks are both expensive and rigid. FlexBooks conform to national and state textbook standards. They are free, easy to update and easy to customize. With FlexBooks, you can customize your textbooks to support your innovative work in the classroom. The CK-12 Foundation provides FlexBooks free to anyone who wants to use them.
If you are a parent or a teacher, we can send you the Assessment and Solution Key Teacher's Edition of the FlexBook you're using.
