Testimonials
See the opinions of students and educators just like you. Select from the following to learn more.
Why Students Love CK-12!
Take a look at what these students have to say about CK-12!
Wonderfull! like that it’s really to the point and precise. There’s lots of pictures and diagrams that are helpful when you are trying to learn.
My teacher made these textbooks, and it has everything that we need for this specific class.
It’s really accessible so it’s easy for the whole class to get on and we just go!
We use it every day because there’s something new that our teacher wants us to look at!
My CK-12 book is really nice because it has all of the information I need in it. Instead of hunting for all of the words and questions I have, it’s all there right in order
Comments from Students
CK-12 has helped me learn science when I struggle.
Israel Estrada
cK12 has helped me understand the concepts my textbook teaches me in a more creative way. I like the pictures and comparisons that are given when explaining something.
Camile Ingram
My learning has become much better.
Tori
thanks i just started to use ck12, but i am proud that its bilingual so ou can get pages translate into french for my french students ,,,merci a vous ck12
Geoffroy
You have very good content
Patricia
It has helped more because I use it almost every day and it is super interesting.
Natalie
I am a above average student and cK-12 has helped me learn at my own pace. Learning at my own pace has helped me keep up the A's. Another way cK-12 has helped me and lots of others in my grade learn. Is I created a study group called math and I send out assignments whenever I can. I also know that we can learn from each other.
Jordan Dugue'
It has helped me with a lot of things such as learning and understanding better. Thanks a lot happy tenth anniversary!!!
Lakelyn Ross
it helped me on everything which is awsome!!! Brah!! goz
Abdulsalam
Ck12 helped me a lot revising lessons and keeping up with my math lessons
Mathis
In a lot of science, CK12 helped me start off my knowledge in science so I could build off that foundation. It has helped me in many various science subjects, from the EM scale to how rocks are formed. And it isn't ever difficult to understand or condescending and easy. And my grade in science is an A. So thank you, CK12!
Alex D.
In a word, it helped me learn more about Chemistry.
Abdul B
CK-12 has helped me by actually making sense when I need information for my science class.
Kaitlyn Potratz
Ck-12 has helped me learn 8th grade algebra
Gavin
CK-12 has helped to improve my Science Grades
Alan
It has made things easier. And Ten YEARS! WOW that sure is a long time
Rafael
Breaking down material into digestible bites.
Tanika Reiss
it helps me in doing my homeworks and searching for the things that makes me curious
Nur Logan
ck12.org has helped me a ot keep it up guys and thank you so much
Canyon
It's a great way to learn about science and other subjects. It has great projects and it's probably my favorite thing to do in Science.
Aaron Dickerson
CK-12 helped me out in areas that some of my teachers do not explain as efficiently.
Ella
It has helped me learn more thank you k12
Takira
CK-12 has helped me understand biology.
Kahrie Stegman
I had a rough time with chemistry but this helped
Rachael
CK-12 helps me understand science a lot better than just randomly taking notes. There's pictures and explanations, too, making it easier to understand the text.
Kaitlyn L
you have taught me how to evaluate problems
Damien
Thank you so much in helping me learn all about science waves, EM waves, etc. I really understood the topic more in depth, and will definitely recommend this website to others! Please make books for economics if not already there. Thank you so much!
Bhavana
It has helped me learn my 2 worst subject and it is now one of my favorite subjects all because of cK-12
Quinn Ames
CK-12 has helped me better understand how the world is and it's amazing. So, congratulations,happy aniversery and thank you for this amazing website. BYE! ;-P
Carissa
CK-12 has given me all the resources and information I need to succeed in my class; and excel in my learning!
Hailey Gough
Ck-12 has halped me get better grades in school. It's been a great study tool for me.
Samantha Mcfarlane
it helped me survive physics last year. i would have been lost without it
Alan Grajeda
It has helped me learn science. In science class we always use this site. My teacher loves this site. Thanks for everything.
Jordan
CK-12 Helped me better understand things that were spoken in-class.
Zach
Its a great site!
Ellen
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
you helped me with math and the periodic table
Dagon Evans
Great way to continue the journey of forever learning!
Alberto Brioso
Hello! You guys have helped me through my Pre-Calculus class and I don't know what I would do without you! Thank you
Abigail Franco
CK-12 has helped me a lot. My biology teachers occasionally assigns us CK-12 assignments to do. One time she made us do 23 different lessons! The whole point is that CK-12 is an easy way to learn and to have fun while doing it. Also I think that if I could change anything about CK-12 I wouldn't even do a thing.
Quintin Sherrod
it made my life easy
Mathunyane Alfred
CK-12 has helped me by allowing me to learn more things every day. I think that CK-12 is the right site for me and i love this site.
Jonvion Bryant
Ck12, has helped become a better student and work harder in my science class.
Lamees Sattar
ck12 hepled me get better grades so far and helped and teached me alot of things i didnt know
Sami Jones
Its helped me study a lot!
Alana
It helped me learn a lot, helped during my biology classes
Ivan R Ramos
It has helped me by teaching me a lot about what I didn't know
Ella U
Ck12 has helped me push myself to be passionate about chemistry. thank you.
Abby Kilpatrick
CK-12 has helped me in a great number of ways with my school.
Elishah Presley
ck-12 helped me with my homework and my project at school
Genice Sverre B. Dagatan
it helped understand how to solve ratios.
Nasia
nesecito que me ayuden con una tarea de geometria
Yuleni Meisa
It helped me to study for my tests, I really love it
Laith
This has helped me study for tests and has helped me in science class.
Haleigh Johnson
OMG!! cK-12 has helped me with sooo many assignments at school!! When my teacher assigns me a page from this website, it helps me with things I don't know, and when I take a quiz afterwards, I get a great grade!! Thank you cK-12!! :D
Wolfesess
I love this website
Camya Boone
helped me understand concepts in chemistry
Aileen Berroya
I love to use this website for 7th grade science it helps soooooo much i love this website.
Ian
CK-12 has helped me a lot with my grades
Immanuel M
IT HAS HELPED ME A LOT IN EXAMS.
Tony Jeeson
the videos were very infomational
Jordan Smith
CK-12 has helped me allot in learning science. i usually can't pay attention in class so this is what i use and it where i learn most of my science honestly and its nice neat orginzaed and just easy to use. so thanks for making this
Samandar Khusenov
Helps me with math and science and it is easy to use and fun thank you Ck - 12
Payton Spears
Ck 12 has helped me as a teacher to find resources
Vernica Lee
Thanks for helping me with science
Selena
ck12 has helped me by helping me learn science and know I am on a A-B on a roll. THANK YOU CK12!!!
Gabriella G.
It has helped me to be able to learn about what we have done in Chemistry, and tests me on what I know.
Dana Mcswain
My teacher was able to teach us great things through ck-12
Olivia Guerrieri
super helpful and easy to use
Ivana
The math and science is the best, and it lets me control when and how I learn. Overall the best homeschool education place.
Galayna Erickson
I use this as a secondary program on my online school!!! i do like it alot keep up the work guys
Serenity C
it has educated me very well , and helped me get into the the 9th grade.
Late'Ya Matthews
You made me get a 75 on a test
Im Mad
CK-12 helps me learn more within 15-20 minutes of science than 1 month of science class. Thanks CK-12!
Aditya Parulekar
Thanks!! This resource has been so helpful. My Science teacher uses a lot in class. This is my go to resource when it comes to Science!!
Yonnie Daniel
It has helped me learn and helped me on my classwork!!!!
Raeleigh-Grace Ruiz
You helped me a lot with science
Abel
They're Just SO GREAT!
Kailey Sterling
helped me learn problems faster
Vicente Tinoco
CK-12 has helped me in a lot of ways. You have helped my in science, math, and other subjects! Thank you!! I also appreciate that you have let me get all A's throughout 6th grade. Hope to study on this site more often!!!
Alayah Clark
CK-12 has been incredible in providing me with information for my biology projects.
Abdullah Alikhan
It helped me with my math and science i got an A+ on my semester exam
Iysis
It help me learn how to turn fractions into decimals
Adriana
just found this random website because i was searching for places with convergent oceanic-oceanic plate boundaries
William
CK-12 has helped me with my homework and things i did not understand. Thankyou
Dajah
Always help me do my lessons with articles about the topic im learning about. Thanks for taking your time and making it all free.
Peter
It boosted me through a lot of math stuff.
Eliott
It has me very much from helping me with science class to improving my knowledge on science and chemistry. I thank who ever has invented this wonderful site and congratulate you on the 10 years you have had this site.
Kaitlyn Davidson
Math is a universal language one, that we don't fully understand, or I feel being taught properly in schools. Thanks to Ck-12, I am able to bridge the gaps in my knowledge regarding basic math concepts and move on to more advanced topic. Thank you for b
Wensley
When I have problems in science, cK-12 is there to help.
Alan Mao
Has provided needed resources and provided us with ideas.
Patricia Aguirre
I have been having problem with solving my algerbra problems
Tracy Robinson
I have been learning a lot from ck-12!!!!!
Veer Sanghavi
Learning Algebra
Elizabeth
ck-12 has helped me prepare for my return to college.
Tony Thompson
Learning new information.
Candice Sabrya Medley
This site has helped me learn about new and different things that I hadn't known before! So, thank you!
Maeve
its dope
James E
You have helped me become a better student.
Kaitlyn D
Helped me get good grades and get better at Biology
Comments from Educators
ck-12 helped me to build my lesson plans.
kaur
CK-12 makes my life easier in terms of extra activities for my students to reinforce what is being discovered in Science.
Álvaro E.
Love the ability to customize lessons!
dabourd
thanks my child is studing in 6th std .i want he knows all babic concept of math and science.thanks
Shobha K.
teaching
bryant
Ck12 has revolutionized the manner in which I teach. This magnificent educational asset has taken the text book out of the classroom and made learning accessible to students anywhere there is a internet connection
Michael R.
Thanks for providing free, high quality resources for kids and teachers! I love the flexible way that resources can be built.
Mark H.
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.
with my son's science project
Marianne
I am just starting to use Ck-12, so far it seems like a great resource for homeschooling my daughters.
Margaret B.
I use it for Credit Recovery Program. My students like it!
Maria
happy 10th anniversiry.
Margaret
love the worksheets
Marcie C.
The drill and practice has helped my son recognize which function a math problem requires.
Marc M.
to edcuate lower class student
Manish
Improveing the motivation of my pupils
Maisa A.
I have read your biology books. With the help of ck books I am able to clear doubts of daughter and its helped me a lot. Thank you very much for CK
M.
video tutorials for lesson plans!
Macie M.
CK-12 helps me find resources necessary for teaching standards and skills that are not in my current text book. It is supplemental material and websites that help me teach!
M Hance
I have just been assigned to teach 7th and 8th grade Science.
Lynn J.
CK-12 has provided resources so that I can be a more effective teacher!!
Lydia C.
i have used ck-12 while home educating my children via google apps
Luna F.
CK-12 has helped me provide online resources for my special education students to access at home!
Lurleen M.
This resource has been invaluable to me. I can use it for remediation and acceleration. Thank you.
Louise P.
with lessons for the 1st grade classroom
Loralei B.
I was able to create worksheet practice for my students.The videos available were also helpful in helping students review concepts
Lotoya G.
This has been an excellent resource for my class room. Our students do not have take home text books since we are a Title 1 school and money is limited. I have used this as a resource for homework and differentiation using your different workbooks. I have also used it as a large group presentation of a topic and then practiced using materials linked. I have also created several "webquest" type activities for use in our computer lab. Thanks for all of the hard work that went into this and I would love to see Social Studies/World/American history as fleshed out as the science is! Loved it!
Lorre C.
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.
cK-12 helped by providing challenging and interesting activities to supplement classroom learning
Lorenza 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.
CK-12 has provided consistent content for math courses that are both adaptable and flexible.
Linda S.
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 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.
I use your lessons as homelearning activities
Lianett H.
My school district went full implementation with the new NGSS standards, but did not provide us with any curriculum. CK-12 saved the day!! Thank you CK-12!!!
Leslie F.
I am a school admin. and I am interested in learning more about Flex books.
Leslie
Well I have not yet explored the site, however I am highly excited about learning this system and seeing how it can be useful for my students.
Leroy J.
CK-12 has helped us with our homeschooling and letting my daughter move at her own pace.
Leigh
CK-12 really helped me last year teaching 7th grade social studies. The content, which was broken down by standard, helped me and my students get a better understanding of the material.
Layne B.
free books!!!
Lauryn C.
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.
I am homeschooling my 8th grader for the last trimester. I am looking for things to make his education complete and fun.
Kristy D.
I use CK12 all the time in my science classes! It is a great summary of all the content, its in one location, and has all the media extras that keep students engaged. They really prefer CK12 to old school textbook assignments. I am teaching a marine scien
Kelli H.
It has helped me with transitioning in a block schedule to incorporate NGSS lesson.
Laurie R.
CK-12 has been a great help daily as I integrate it into my Biology and Environmental Science Classes. My students love it and I can not thank the developers enough for making student & teacher friendly resources
Laurette S.
I have been able to take the real world applications and interesting topics from ck-12 and incorporate them into my science lessons.
Lauren H.
I am a high school biology and chemistry teacher. I assign ck-12 as a resource for students who struggle with concepts. I love the Real Life articles. The students get to understand why science is important. Thank you
Laura S.
My students love the videos and information on this site. I feel that it greatly enhances student learning.
Laura M.
cK-12 has helped me teach my child on several subjects. It is a fantastic resource weather you homeschool or not.
Laura G.
With our "bring your own device" initiative, our corporation no longer buys textbooks. Thank you for giving me a way to still provide my students a way to have a good information source they can continually turn to.
Laura
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.
I have only recently discovered this wonderful site. I am using it as an actual teaching resource, whereby I use it to flip my class. So students will work through the content at home, regroup in class to discuss topics and issues and then they write the
Kyle
really helpful for my children
Kumudini
CK-12 has helped me positively impact student achievement in my classroom! I have found numerous problems that I have used with my students, discovered ways to improve my instruction, and developed a clearer understanding of how to target my instruction and interventions!
Kurt H.
CK12 works well with our 1-1 ipad program in our middle school. Students carry their work and flex books around in one small device! Yea, for saving their little spinal cords!
Kristin D.
cK12 has helped me immensely with book resources for my students. Now they get to read smaller sections and not be so encumbered with such large science textbooks. The practice is becoming a very valuable tool with my students as well.
Kristin
I am a Science Olympiad coach for Anatomy and Physiology at a middle school. This is our first year as a team, so I have spent hours searching for materials. Your site offers just what we need.
Kippi F.
kindly email a lesson plan for Angles forms by intersecting secants.
Kimberlee
Finding material for my chemistry students, and also creating my own online text.
Kim W.
I use Ck-12 to find resources for my high school Significant Support Needs class.
Kim C.
CK-12 has revolutionized they way I work with students. I am most especially grateful because it allows me to work with students who are distance learners.
Kim
ck-12 has helped me immensely regarding my preparation for the tasc ged. Thank you so much for this excellent educational website !
Kevin N.
Its fantastically helpful. My students LOVE ITTT!!!!!
Kent R.
You have helped gain me so many assignments with full distinctions
Kelly N.
CK-12 is off thee chart! I love using this tool in my chemistry classroom because it brings in a variety of perspectives and does progressive testing. A great tool for getting them ready for what NGSS is bringing down the pipeline.
Kelly M.
So many STEM resources at all grade levels available from ck-12!
Katy
I love the interactive links in the e-book. I have used the resource for reviews and absent students.
Katy W.
I love cK12! I have used it in my high school science classes for 4 years now. I love how well the readings coordinate with the interactives and I love how I can integrate it into my Edmodo class pages as well. I REALLY love how I can find the same topic at different reading levels and in Spanish so that I can make sure every one of my students can learn science content and themes at any skill level.
Katie
Tutoring!
Katie A.
It's my first year in a new school, with a completely different curriculum structure than I'm used to teaching in biology, and my class did not come with any textbooks! For the first 2 months of school I would spend countless hours trying to combine diffe
Kathryn S.
It has helped my students learn
Kathryn
We frequently use copies of the content to send with students who are suspended, sick or otherwise unable to attend class. It's saved many headaches when trying to find material for these students.
Kathleen N.
CK-12 has provided relevant reaading material for my students... don't know what our school would do without your support
Kathleen L.
Love the free online science textbooks
Kate O.
Thank you for providing such a comprehensive and high quality library of resources! I love the customizable textbooks. Thank you!
Kate
CK-12 has been incredible. I've been using it to homeschool my middle-schooler for two years now, and it is unbeatable.
Kasheia
CK-12 is a terrific resource. I'm the science chair at an independent school in Los Angeles. We have been moving away from physical texts for a while and CK-12 is the best online alternative in our opinion. Students enjoy the varied learning formats and teachers appreciate the class management options. Happy Birthday CK-12!!!!
Karl F.
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.