Testimonials

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

CK-12 is the High Quality Online Resource Teachers and Students Can Trust
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CK-12 is the High Quality Online Resource Teachers and Students Can Trust
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
It's Easy for Students to Search CK-12 FlexBooks®
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It's Easy for Students to Search CK-12 FlexBooks®
Customizing CK-12 with Regional Content
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Customizing CK-12 with Regional Content
CK-12 Simulations Lead to Richer Learning Experiences
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CK-12 Simulations Lead to Richer Learning Experiences
OER Publishing and Sharing on CK-12
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OER Publishing and Sharing on CK-12
School Districts Adapting to Electronic Textbooks with CK-12
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School Districts Adapting to Electronic Textbooks with CK-12
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
Every time I open CK-12 There Is Something New and Engaging
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Every time I open CK-12 There Is Something New and Engaging
Using CK-12 Modalities to Bring Learning to Life
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Using CK-12 Modalities to Bring Learning to Life
Worry-Free Content Curation with CK-12 Foundation
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Worry-Free Content Curation with CK-12 Foundation
With CK-12, Updating Content has Never Been Easier
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With CK-12, Updating Content has Never Been Easier

Comments from Educators

In many instances, available resources are not sufficient to explain a particular problem, so it is a relief to be able to turn to cK-12 for help.

Marion N.

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

Biswajit

preparing for physics lessons

Adeoye

its helps me get better and learn new resources

Eric S.

wonderful resource for my homeschoolers

Easton

I'm just starting to use it. It looks agreat resource for me especially being a new teacher.

Abdirashid A.

Helped me in my Anatomy and Biology classes - reinforcing content through grade appropriate reading

Amy B.

Send Geometry support materials

Emmanuel N.

cK-12 has provided me with material to support my curriculum, and it offers me a variety of activities to support the diverse learners and abilities in my class. Thanks cK-12; you are a teacher's dream come true.

Judith

Thanks for the science and math content

Donna H.

CK-12 helps out on 2 of my subjects and it makes learning easy. And, some of the videos are funny and it makes learning fun too. I love CK-12 because I met some people who work for it and they were so nice. CK-12 is awesome, and I think it should never be

Lillian B.

This website was a great thing for us to us because it help us to do many of our assignments. The class and I really appreciate this website and what it has provided for us. My class and I have a new assignment to do and we use cK-12 because it makes us do different things on it to provide us and them with different information they need.

Billy S.

CK12 was a great resource for my middle school students because they were preloaded on their devices. Our internet connections were spotty at best in my classroom and CK12 provided a stable platform for me to teach and students to learn.

Jennifer

It's easy to create assignments for my students and I love that they don't discriminate the fact that I homeschool my children and use this.I hope in the future they have more english to use.Thank you.

Laurisa N.

Ck-12 has brought science to life in my classroom with online videos, challenging reading and built in assessments to help my students know what they are learning.

Courtney M.

CK12.org has given me an online text and teaching materials that are NGSS aligned. This has enabled me to teach to the standards even though our school does not have a physical textbook. This has been such a lifesaver as a junior high science teacher!

Anne K.

We use cK-12 for our high school Science and math curriculums and the students love and the teachers find it easy to use and an enhancement over traditional textbooks.

Jack

It is a great multimedia resource that students like to use collaboratively and independently.

John H.

Comments from Students

helped me learn problems faster

Vicente Tinoco

i guess its easy to do work on the go now

Halen Willoughby

It has helped me with understanding math better, and let me tell you I suck at math so when I understand it, it is kind of a celebration time for me.

Naomi K

I am a biology student so it helps me a lot when doing assignment

Ikhmal Syuqkin Bin Ismail

It helped me study for some tests that I got 100 on

Garret

CK12 has helped me through many tough times. It's all because of ck12 that I could get back on track in maths class and I could get a perfect score. It has been immensely helpful. Thank you so much.

Taiba Abid

well it helped me learn stuff that i needed to learn for science

Alex O

I like this. It helps me learn more then I used to know.

Tanaiya Bulloch

Helped me learn stuff

Whopper Jr

It has helped me learn and helped me on my classwork!!!!

Raeleigh-Grace Ruiz

This site has helped me learn about new and different things that I hadn't known before! So, thank you!

Maeve

Ck-12 helped me know about all about the sources of energy.

Alaena R.

Ck12 helped me in learn more about history, it also helped me in my reading and practice with the English. Thank you Ck12.

Ivanna Najera Garcia

It has helped me pass science tests

Hallie

It helped with math and science

Glen

I'm usually great with math but I always struggled with division and ck-12 has helped me concur that issue in his enlightened my math life.

Akinle Armand

Its a great site!

Ellen

Ck-12 is great for catching up on reading!

Oakley