How to Report Content Errors

CK-12 Foundation takes content errors seriously, and will fix them as quickly as possible. 

FlexBook® Textbook or Concept Errors

How to report an error found in our textbooks or concepts:

Please fill out this form with the details.

Practice Question Errors

How to report an error found in our practice questions.

1. Go to the practice question.
2. Click Improve this question.
3. Select a Type of Issue.
4. Provide your comments in Details.