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

cK-12 helped by providing challenging and interesting activities to supplement classroom learning

Lorenza B.

I work at a Stem High School - Hudson Valley P-Tech in NY. Our mission is to connect math to the real world for our students. I liked your distance formula lesson and right now I am looking at your amplitude, Freq & period info. Keep up the good work!!

Lorraine N.

with lessons for the 1st grade classroom

Loralei B.

cK-12 has been very helpful in providing short assessments that I use as homework, bell-ringers, and exit- slip activities in Science!!!!!

LJ B.

WOW! I just absolutely can not express so helpful CK-12 has been in my science teaching. We are moving away from our old standards and adopting NGSS. We currently do not have a textbook to use with the students and CK-12 has been a life saver! Thank you!

Lisa N.

I use ck-12 books in my science classes, especially in Advanced Biology. Thanks so much for the awesome resources!!

Lisa J.

I am home schooling my 15 year old son and have been having financial problems. If it were not for this web site, I would be struggling to provide him with proper resources to teach him. Thank you so much!

Lindy S.

homeschool

Lindsay P.

I was asked to teach a high school physics class at a homeschool coop. It's been a great many years since I had physics in college. cK-12 helped me re-learn physics for myself, and it gave me ideas for what to teach. My students and I especially apprec

Linda M.

CK-12 has provided consistent content for math courses that are both adaptable and flexible.

Linda S.

Comments from Students

ck-12 help me to improve a better grade and it help me on my skills on math i think this a phenomenal,amagazing and magnificent app that all teachers should use.C:

Grecia O.

It helped me learn.

Graham M.

It's really easy to use and kindof fun to use rather than other online education websites.

Gracie H.

It has helped me because sometimes I don't get my teacher and then I go and search websites that will help me and then my teacher told me to use ck-12 and that's what helped me and she puts she puts assignments on ck-12 for the whole class and sometimes she puts science assignments.

Gracia

Science has always been a harder subject for me, but ck-12 has super helpful and interesting information that is easily comprehended and fun to read. Thanks, and happy birthday!

Grace S.

It helped me do science.

Grace P.

hi ck-12! i really love studying with ck-12

Grace

I'm just getting started, but from what I already know this program makes education easier and faster. Also, it helps when it comes to management of time education.

Glorious H.

I personally like the idea of flash cards and execises, this are very excellent when it comes to learners revision

Gaurav K.

It helped with all the facts.

Giovanni W.