CK-12 is an online platform for students and teachers that provides information on a multitude of subjects and disciplines. The educator version of the site offers a range of math resources from elementary principles to calculus. Science categories include Earth science, biology, chemistry and physics. Using CK-12’s FlexBook feature, teachers can put together chapters from textbooks in any of these subjects to create customized lesson plans. All textbook content is free and written to comply with state standards. By providing all this, CK-12 aims to give teachers a platform that can be used to tailor individual lessons and teach kids at their own pace.
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