Learning made simple for you, the student.
Start with a subject below.

Mathematics

Science

How We Help You Learn

Books

Use our comprehensive textbooks to support your learning.

Concepts

Bite-sized lessons to help you master topics.

Interactive

Videos and multimedia simulations bring learning to life.

Exercises

Get instant feedback and track your progress.

Anytime, Anywhere

Read online, print a copy, or use it on any device. Our content can be used with the Kindle, iPad, NOOK, and more.

More Ways to Learn

studyHELP
Want help with a pesky question for an assignment that is due tomorrow? Get help on studyHELP. Sign in and ask away your questions.

FlexMath
Combining engaging lessons, interactive practice, adaptive assessment, extensive scaffolding for struggling learners of Algebra. Try it now.

I Need A Pencil
Free online SAT preparation with practice questions and an adaptive SAT score predictor.
Try it Now.

Braingenie
Build deep mastery & sharpen problem-solving skills through the most comprehensive K-12 math and science practices.
Try it Now.

Thanks, Murugan!

Murugan's passion and vision for technology has indelibly impacted education, his friends, colleagues, students, and teachers. Our team at CK-12 want to say,

"Thank you, Murugan." We love you.

Holding you in our hearts forever, rest in peace, our dearest friend, Murugan Pal. 1966 - 2012

Write your message

Learning made simple for you, the student.Start with a subject below.