Testimonials

See the opinions of students and educators just like you. Select from the following to learn more.

Let Your Students Explore with CK-12!
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Let Your Students Explore with CK-12!
Using CK-12 Every Day in Class
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Using CK-12 Every Day in Class
Instantly See CK-12 Content in More Than 90 Languages
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Instantly See CK-12 Content in More Than 90 Languages
Customizing CK-12 with Regional Content
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Customizing CK-12 with Regional Content
Save Money and Own Your Standards with CK-12
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Save Money and Own Your Standards with CK-12
Sharing CK-12 with Google Classroom and More
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Sharing CK-12 with Google Classroom and More
Why Teachers Love CK-12 FlexBooks®
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Why Teachers Love CK-12 FlexBooks®
CK-12's Free, Platform-Agnostic System for Finding and Editing OER Content
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CK-12's Free, Platform-Agnostic System for Finding and Editing OER Content
CK-12's PLIX and Interactives Help Students to Work Together
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CK-12's PLIX and Interactives Help Students to Work Together
CK-12 Made My Job Easier!
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CK-12 Made My Job Easier!
"I Use CK-12 Videos Whenever Possible"
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"I Use CK-12 Videos Whenever Possible"
CK-12 Meets and Exceeds Standards Requirements
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CK-12 Meets and Exceeds Standards Requirements

Comments from Educators

In the digital age I find have a paper textbook for a dynamic science world limiting and not budget wise. Thank you for making this service available! I find it very useful as a resource in my classroom.

Charles R.

teaching

bryant

Amazing resource! With so many statewide educational budget cuts, it has been extremely difficult to find quality teaching resources. cK-12 has filled that niche quite nicely! I would recommend this valuable site to anyone. Thanks!

Bryan H.

Ck12.org has helped each and every student who has come to our center. I was been a great experience for our students, as well as a enormous help for the teachers! CK12.org has made our learning journey easier and more exciting!!!

Bright Harbor Academy

Identify resources staff can use to develop relevant science curriculum

Brian A.

This is a great "go-to" site for my daughter and I when she is struggling with a new math concept and needs that extra help. Thanks cK-12!!

Brenda S.

helped me learn how to do my math better

Brady

CK12 has helped me assist others by allowing them to be a part of this learning initiative.

Boris A.

I LOVE YOU guys thank u very much i appreciate your efforts for helping students to learn their subjects.

Biswajit

Thankyou thankyou thankyou very much for providing these resources for free. ck-12.org is very great resource for students it is very helpful in schools and out of schools for self study.

Biswajit

Comments from Students

This site helps me a lot to learn the concept in easy way by providing the lot of dynamic web page representing the main theme of concepts.

Murali

It has helped me with writing, math, and physical science. I have passed many of my test in school because of this website.

Claude M.

HI! We use this website every day in class and we are writing a 17 paragraph research paper on energy. We are so happy its there!

Margot R.

yall helped me because yall have alot of infermation and i appretionate that so i have been getting good grades on my report and progress report card so thank youu soo much !

Macayla J.

CK-12 has helped me with my 6th grade homework several times! Happy 10th Anniversary!

Logan D.

thank you i now have fun doing homework and activities thank you very much and Happy Anniversary!!!

Kimoni D.

Thank you for helping me out with my science homework! I probably would have failed without you. My science teacher even tells us to always trust CK-12. Congrats on your 10th anniversary!

Jennifer

I use CK-12 for my science, math, and asking questions. Since I am home schooled this website is a great thing for me because it is a boost on my education and for others who are like me. I really like that you can ask questions and answer them as well. Y

Lexi

it helped me by if i did not know something all i had to to was type what i needed t know in and i would learn XD

Jazmyne

Hi ck-12!!! congratulations!! Im one year older then you!! But....... you guys helped me get a A in science class and my teacher was very impress with my work I have. I just started when I first became a 6th grader, and I was pretty mad I had too start a new website. I always had gotten a D in science and I love science, so it hurt me to see I was failing. But I came home that day and my mom told me to do it any way, so I signed up and then BOOM!!! I fell in love with this website!! My teacher always told me that I needed some help with science, so I wold get on ck-12 and asked a helper for some help. My teacher always told me I could study more of a topic to get caught up with the other students, so I would hop on ck-12 and read,study,watch,and write down the topic. Since I started ck-12 I have an A in science,I have honor roll, and help other kids with science too!! So now that I am almost finished, congrats on having your 10th birthday!! Without you guys I dont know were I would be.Happy birthday!!! -Jasmine Whitfield-

Jasmine W.