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
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
you guys have helped me with learning new things
Betty
CK-12 helped me by teaching more stuff I haven't even learned in school yet!
Samuel Biersmith
CK-12 has helped my grades improve
Dakota
CK12 has helped me learn things my teacher and school can't provide.
Evelin
My teacher assigns work based off articles from your website and you always have clear answers in the readings so thanks for giving me easy 100's.
Jalyn Grace
cK-12 has helped me get through lots of class work and has helped me learn lots of things!
Maggie R.
You helped me look and learn about minerals and many more things. HAPPY ANNIVERSARY!
Candace
you have helped me in many ways during school hours by giving me a cite where i can study for test.
Natalie Mcginity
learned more than my teachers teach me!
Matt
tremendously helped my students to understand science concepts, and motivated to do homework
Yolanda
you helped me with science grade
Faith
Helped me in social studies.
Paul Trumpore
Hi ck-12!!! congratulations!! Im one year older then you!! But....... you guys helped me get a A in science class and my teacher was very impress with my work I have. I just started when I first became a 6th grader, and I was pretty mad I had too start a new website. I always had gotten a D in science and I love science
Jasmine Whitfield
AMAZING FACTS AND MINI LESSON CONGRATES
Billy
Thanks or helping with my homework!
Jordan Bakar
hi there. Thank you for helping me learn.
Halley
u help me improve in all my subjects in school
Seth
Ck-12 has primarily helped with science in certain ways and im glad it still exists today
Daden
It helped me study for my science mid term exam.Thanks to ck12 I have got a full 100 on my science mid-term! Thank you ck12!
Vinnie
It has helped me with all subjects over the past 1 to 2 years.
Samarj Clifton
It is a very effective site.
Elizabeth Crockett
I love this thing so much because it helps me to study for my upcoming quizes
Bianca Rivera
CK-12 has helped me by letting me learn about science and helping me with my work at school. If I didn't have this web site I never could of learned what I need to learn about the science.
Tam
You helped me and my class with science and on awesome stuff like that!
Tony
They have helped me with resources
Ntokoozo
Best helper for me in my study
Ibrahim
cK-12 has helped me alot
Immanuel Maye
it help me with a lot of stuff that i thought i coulden't do myself
Dameon
It helped me with science and math thank you!
Dalton
It helps me learn stuff i didnt know.
Dallon Spendlove
CK-12 has helped me to find more fun and challenging math to do. I can get a lot of math work done just by getting on the computer and logging in. Since the variety on CK-12 is how it is, i can find many new, and interesting ways to do math.
Samuel Stolz
Good exercises
Pavel Epshteyn
You can help me to find the difference between asexual reproduction sexual reproduction
Trendy
CK-12 helped me with my school work.
Addison
Made me happy
Pau La
CK-12 has helped me maintain and keep a good grade in ACC Chemistry this year. Keep up the good work!
Dalton Polley
It has helped me understand my homework
Quintell Davis
Over time it has daintily helped me ass tests more before i would always get below 60 percents now i am the best in the class, in quarterly exams and quizzes
Vinoo
It helped me with my matter project and my chemical engineering paper. I love this website.
Mason Palesh
y'all helped me learn about minerals.
Izzy
I use ck-12 for science at my middle school, its a studying recourse and study guide for many tests, thanks.
Abby
CK-12 has helped me allot in my grades i told my friends about this site they liked it and good marks because of u Ck-12 thank you.
Imad
CK-12 helped me in very very many diverse ways!
Victoria Kim
I am a home schooled student and ck-12 is one of my favorite online resources. I can't wait to see what the next ten years holds for ck-12. Keep up the good work. Thank you.
Kaitlyn
CK-12 has helped me understand science and science terms. I take notes on the articles CK-12 provides and I get good grades on my assignments.
Abraham
It has helped me learn more about science and more about reflection and light.
Serenity
helped me improve in 6 grade math like terms and expressions.
Nasmia .A. Davis
This site helped me that I am passing all my grades and I appreciate all the help.
Matthew Abadam
CK-12 has helped me in many ways when I get on the computer to learn i go start to here because it docent just teach you well but its fun to learn and read the chapters in ck-12. So thank you for doing your best at making this a amazing thing. Thank you ck-12.
Aaron Mckeeman
Hi. congratulations. Very useful site.
Victor Manuel
It was great because so I can send messages to my teacher and have free stuff.............
Tammy Chen
Helped me pass my classes. Very helpful!
Elishah Arnold
I don't understand why it works like this but, it is amazing so I like it but, I think it shouldn't have a login for the students the teachers should only have a login. I love this website it helps me with my learning a lot so, thank you and have a good y
Taniya Henderson
Please do not tell anyone my name and Email, I am trusting you with it. CK-12 has helped me so much, I am in 6th grade and were using it for Science, It is so much helpful. Last year we used it for Social Studies and it was confusing but it was helpful. Thank you, CK-12.
Anonymous
it helped me by knowing new stuff and it is better than reading it of a book thank you for making the you guys are awesome
Makayla
I did a seventh grade project using your website. It was about the different body systems and your site explained it good. Keep it up! Looking forward to coming back and seeing what's new.
Sd
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
Thank sfor great lessons in Science and History.
K. Pinnell
CK-12 has helped me by giving me easy access to textbooks I need for my school work.
Faith Brandt
You help me get ahead in the classroom.
Aj
It has helped me with my math skills so far, thank you!
Ralphel
CK-12 has helped me because it has taught me things about space and the earth that i maight of never had learned with a different site. Also CK-12 has done an amazing job making their material easy to use and it isnt confusing
Hailey
Thanks U very much for building up this wonderful platform for children who need help. I am devoting in a volunteer program and their children like CK very much!
Yesmine
it has helped me alot during class. it was better than a book to learn out of.
Serenity W
Ck-12 helps me in science because, they use this website for teaching us. Its working!!!!
Not Telling
Happy anniversary. ck-12 had helped me, although I don't come to the website regularly. But thanks to ck-12. happy anniversary once again, hurray!!!
Ifedunjoledo
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
Thank you cK-12! You helped me so many times to study for my chemistry and human body tests and quizzes! I can't wait till I go into astronomy and learn all about it! Thank you for everything!
Alex
It is a good website to understand the concepts of things
Masooma
You have helped me in my schooling and I will be getting into PCC because of you guys and I will be attending the early college program only cause
Elijah Mustain
CK12 has helped me pass my biology class because my teacher just uses the same questions as the ones on the quizzes
Payton Wilosn
Great resource to learn the most complicated topics in simple ways.
Sean Mclaughlin
Ck-12 has helped me a lot with science so I was wanting to challenge myself with 8th grade level.
Elliote Dinovo
ck-12 has helped me by giving me work and helping me.Pushing me to pick up my grades.Expiring me to think that i can do anything i want to.By loving me and guiding me through the way of life.Being a leader not a follower and bully people because that just
Tanesha
You've made understanding physics seem so easy. Thank you!!!!
Aamiah
An awesome way to learn and study new things.
Itsyeboi
CK-12 has helped me learn the important facts about things I didin't know. It is a great online source to help out with questions you arent sure about.
Pauline
it help my teacher because we use it in her classroom. I guess you guys helped with learning to. So congratulation.
Yvonne
Thanks!!!!!!!!!!!
Yoselin Huequis-Ayala
Ive learned alot about science and it helped me understand chemicals better
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.