Flexbooks

cK-12 Flexbooks has free downloadable STEM textbooks for K12 students and teachers, customizable and standards-aligned. Subjects currently available are science, technology, engineering and mathematics. The books are available in three formats - downloadable .pdf file, .hmtl for online interactive linkable content audio and video, and downloadable for a text readers. The textbooks can be downloaded as free ebooks in Kindle format from Amazon.com or in iPad format from Apple's iBookstore. There are also interactive flexbook quiz apps available for download from iTunes and the Android Market.

To view or share any accompanying problem set, answer set, activity, worksheet, or lesson plan, or to customize the textbook content for you needs, free registration and login is required.