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

This website has helped me to develop a love of knowledge in a fun yet challenging manner.

Mateo

We do a lot of science work on this, and it is very helpful!

Olivia

It has helped me with my math skills so far, thank you!

Ralphel

it helps a lot with science and other things like that

Alanna

You helped me get through high school. Thank You

Verona

It let me watch better, more improved videos and i was veryyyyyyyyy, fun during these videos.

Nasiera Huff

I use this as a secondary program on my online school!!! i do like it alot keep up the work guys

Serenity C

Hello,CK-12! As a non-native English speaker,I have been reading CK-12 textbooks for learning not only STEM but also English. I really appreciate your hard work to provide such a good learning platform for so long. Wish you all happiness,health and prosper

Weilai

Ck-12 has really helped me with understanding science, and in finishing my homework. Thank you Ck-12!!!

Daksh Kohar

CK-12 is a fantastic resource website that make learn way much more easier thank you and happy 10th anniversary

Abel I

It helped me learn everything in a fun way!!!!! I was also able to understand what they were trying to tell me!

Aime Ramos Delcomte

It boosted me through a lot of math stuff.

Eliott

it help my teacher because we use it in her classroom. I guess you guys helped with learning to. So congratulation.

Yvonne

you helped me with math and the periodic table

Dagon Evans

I LOVE CK12, always educating me in a fun and easy to understand style

Ola

CK12 has helped me pass my biology class because my teacher just uses the same questions as the ones on the quizzes

Payton Wilosn

Helped me prepare for my teacher certification math portion.

Tomeka Daugherty

CK-12 helped me because it can give me answers on any assignment to pass Biology class.

James Dinkins