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

I like to have well rounded lessons and your lessons are easy to use on the iPad.

Karen S.

I have used it with Google classroom. When introducing a unit, I will have students view a video, take notes and follow-up with a discussion of what they learned. Students will complete some practice on the concept.

Karen E.

I teach at-risk troubled students in a Disciplinary Alternative Education Program setting. Most of my Students have gaps in their Mathematical Foundation. CK12.org helps eliminate those gaps. A strong Mathematical foundation is required in many technic

Karen

ck-12 is helping me design my own text book for students. It is great that I can incorporate desmos activities and hands on learning.

Kande W.

Well, im a teacher and a instructor in Mexico, and my students use this pages too much

Julio R.

I just found this website yesterday, and I think that it's awesome! I can't wait to use this all the time in my classroom! Thanks!!

Julie B.

CK-12 has helped me keep my students on board with with their math skills by having videos and reading assignments in one place. I love this site as a mathematics instructor.

Judith B.

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

it provides my science corrculum

Joshua F.

helped my 2nd grade students practice, good site

Juan G.

It is a great resource. It provides me alternatives that articulates Language Arts Standard -State & Common Core- in my sciences classes -7th to 12th.

Jose R.

Our K-12 Science Curriculum is using cK-12 as an online resource tool.

Josh S.

help me with developing lesson plans for ELA or English

Jose

I've been working with a student who is preparing to take a nursing exam. It it difficult to find a single website that combines all the subjects on the exam - CK-12 is one of the few and definitely the most comprehensive. The breadth of content on CK-12 is remarkable. The material is almost always of a very high quality. I'm happy to have discovered the site and will continue to incorporate its resources into my future teaching.

John P.

cK-12 helps my students learn Life Science because the lessons are structured in just the right format, with much available in the form of support and resources. Thank you cK12!

Jose A

CK 12 is a great resource to use both in the classroom and for homework. The links to the Canvas platform are very advantageous to me and cut my grading time in half.

John R.

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

John H.

Help my students learn in their Science class.

John B.

It's a very fun and interactive way to teach and sum up the boring information teachers repeat again and again.

Joe M.

I have used cK-12 to help teach and plan lessons for my students.

John A.

Comments from Students

CK12 is the best online learning source ever.

Mason Ramos

Hi. it works a lot espically in school to help me understand things to help me proceed in life.

Naomi

CK-12 helped me with the water cycle and many other things, too.

Sean

Ck-12 helped me understand cell structure.

Mattea

this has helped me throughout my science grade. SO THANK YOU!!!!!!!

Careena

It helped me with astronomy

Natalia

Thank you for providing your resources in my Chemistry class. I have learned a lot from your texts. I learned about how ionic and ternary compounds bond together.

Tony Maggio

It has helped me through math a lot. Plus it got me a few extra points in my math grade

Toran Daylee Brown

its helped me so much, like sooooooo much, hmu ;0

Bethany Rimmer

i guess its easy to do work on the go now

Halen Willoughby

your videos and lessons helped me a lot. thank you so much . keep up the great work!!!!!!!

Imali

I love it! Thanks sooooo very much! A GREAT alternative resource from the traditional textbook.

Venise Borum

CK-12 has helped me by finding anything that needed for me to succeed in school.

Toma

It is has helped me learn a lot more about Science it is So Amazing I love it so much my 7th Grade teacher also uses it a lot.. when we talk about earth science and other things.....

Fatima

its helped me learn a lot about science. and i didn't know a lot of things i know now today! HAPPY ANNIVERSARY!!!!

Maegan Jones

i didn't know what orbitals were until now thanks you

James

i just started but so far has been great

Mahalia Barnes

it helped me in my science class

Ja'Crispy

it helped me get better at math and helped me raise my math grade from a 45 to a 89

Faruk

Its a great website

Blake