CK-12 FlexBook® textbooks contain materials that have been developed in step with national, state, and Common Core standards when possible. All of our textbooks are reviewed by subject matter experts to ensure adherence to those standards.
How to find standards-aligned textbook:
- Go to www.ck12.org/teacher
- Go to the Find a Standards-Aligned FlexBook® Textbook section.
- Select a State or standard set.
- Select a Subject.
- Select a Grade.