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 is amazing. My students love the worksheets!
Joe
i love ck12! i can use it to work with my small asian and african children!
Jimmel
The CK flexbook has allowed our science department to have an up to date resource for most of our science classes. We have not had hardcopy text books for over 20 years.
Jim L.
It has been a great resource to use. I believe it benefits my students more than me, but it is certainly been a useful tool-resource.
Jim K.
CK-12 IS AMAZING! It deepened my child's knowledge and understanding involving geology, health, and much more! Thanks a bunch for always being there for my child when he most needed it.
Jewel
I use it with special education students to find articles at lower reading levels. I also post links to articles on google classroom for students to read to reinforce their learning from class.
Jessica D.
This is my first time at your website. I have demystified mathematics and looking to create and publish projects that enable students to become accountable for sense making to overcome previous barriers to progressive math studies to qualify with problem solving skills for 21st century careers from math-based STEM field curriculums for starting salaries of $60,000.
Jerry R.
GIVES READING ACTIVITIES TO KIDS
Jenny B.
Providing great resources for my homeschooling needs
Jenny
cK-12 is a wonderful resource. I am a middle grades science teacher and have enjoyed this resource on a weekly basis.
Jennifer R.
Congratulations! You have done good work and helped many in their education journey. Interactive practices, instantly graded tests, and outlines and explanations, including videos and PLIXes, have helped me and my math students.
Jennifer T.
Amazing resources for my 5th grade class! Grateful for it!
Jennifer S.
I value cK-12 as a resource. I am a middle school science teacher and use cK-12's website on a weekly basis.
Jennifer W.
Looking for a better way to explain scale drawings and proportions to my special education students
Jennifer L.
It helped my son so much he is algebra 1 and is passing it very well
Jennifer D.
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
CK-12 has helped my chemistry students to understand course concepts better. Students enjoy the interactive tutorials: these online tutorials help to differentiate learning in a more engaging way. I LOVE using CK-12 in my science classes!
Jeff O.
lesson planning
Jeannie
Great resources, and learning sequences, available to students in school and at home. Thank you for your site it is invaluable
Jeannette M.
Happy Birthday
Jay
By making me a more competent teacher.
Jayson R.
happy birthday
Jaun C.
thanks u have helped me a lot ..just add more materials especially on geosciences
Jaspin K.
Hello ck-12, congratulations on your 10th anniversary! This is my first time on the site so i can't really give you a good feedback yet , but rest assured i am thankful for being able to find the site.
Jasper P.
I am a special education teacher, I use information to help kids understand concepts in the biology class.
Jason V.
It has helped me support my students with on so many levels.
Jason P.
Absolutely an amazing experience. I love that I can customize the textbooks to include what I believe is relevant in the order that I feel is a good flow. Thank you for saving my district so much money!
Jason W.
CK-12 has become a weekly extension activity for my middle school science students.
Jason B.
classroom assignments for Night by Elie Weisel
Janet R.
You have flex books which have been a great tool for my students to read and watch videoclips on Ecology. I look forward to using your flex books on Evolution.
Janet G.
CK12 is a fantastic FREE resource that is comprehensive and engaging. I want my students to learn to look up information and use Internet resources and CK12 provides the opportunity for them to look things up without my help. The readings are clear and I
Jan
Provides plenty of well structured lessons
Janet
The plix and other resources have been very helpful in allowing me to address different types of learners.
James S.
I am using CK-12 in both my chemistry and physics classes this year which is my 37th year in teaching. When I tell people I use CK12 to make customizable free electronic textbooks, people are very surprised that it is possible.
James P.
many teaching resources are getting this site for me
Jaleesa
At a time when we were not able to continue paying for private instructions, we found this site and it was our salvation. We valued the set up and the freedom it presented to design the best course of action for 8th grade studies. Now moving on into 9th grade studies and more diligent record keeping, we are continuing on at the 9th grade level.
James L.
What a great resource. The flex books are excellent by themselves , but with the ability to edit them, they are fantastic. I especially appreciate the differentiated levels of the flex books. I use the middle school book for my 8th grade prep students
James G.
Teaching
Jacqueline S.
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
First year using completely digital books in 7th science thanks to you! Awesome!
J Daniels
Hello guys. Very Good Job, Happy 10th Anniversary
Izzy F.
It has helped me with very fun and creative activities to deliver meaningful lesson to students of different learning abilities.
Isela
I love science and the online books are so easy to access! I love the ck-12 website home page thing! every thing is so well organized! I just love ck-12!
Isabella
It has help students grasp concepts via video and plix shown by increased test scores on weekly exams and it has help me save time gathering these resources.
Iris H.
CK-12 has helped me develop lessons that are interactive and present the material in a fun way. THANK YOU!
Holly
I used some of the lessons for my national board certification. Lessons from ck-12 have helped my students to understand concepts from readings and videos provided. Love Ck-12
Holly D.
I can communicate with my children about assignments when I am working and I the resources have been a valuable resource for our classes with multi-faceted view points and study aids.... Thank you
Hodge Home School Academy
I am a newbie here but CK-12 has helped me a lot in teaching my students. Thank you, CK-12!
Helena K.
it helped me in class
Hannah
You folks have done a great job getting the mental pictures of experts into the minds of novices. What a nice body of work!
Gregg S.
CK-12 has helped me get text into the students hands
Grant R.
NOT AT ALL
Gracie
Simply put " You guys made my life easier!!!"
Gopalakrishnan R.
CK-12 has been an awesome resource! It provided much needed Biology resources for my daughter when she was a freshman.
Gladys
It has helped my students learn and check understanding in biology and biotechnology and really brings great readings and videos together to teach difficult concepts
Giselle G.
CK-12 reading selection and real world applications are engaging and informative. I like that the content is aligned to NGSS and that the lexile level and academic language support make the content accessible to challenged learners. The PLIX interactives are graphically -appealing concept reinforcements.
Gina W.
I use Ck-12 all the time in my Google classroom. It is appropriate and gives a variety for all abilities. Thank you
Gina R.
it helped me a lot. several lessons gave me ideas on how to attack and execute my lessons.
Gigi G.
it has helped me to attain my bsc
Garvin M.
I'm a new teacher in an under-funded rural school district. I needed something to help me find quality materials for my classes. CK-12 literally saved me my first year. I will always be grateful for ck-12.
Gage O.
Provides revision.
Gabriella R.
ck12 has help me by making me study even harder i am really excited that i am using ck12 and i would give you all a congradulations your 10th anniversary you did work hard for this
Gabriela C.
I'm using CK-12 for the first time to teach ESL Science. The materials seem interesting.
Gabriel L.
lol idk just joined ttyl
Fredrick W.
money
Freedom D.
Congratulations on your 10th anniversary
Freddie
Great resources
Fred
this website made reading easy to access
Francisco V.
with school
France R.
Excellent resource for students struggling with homework.
Flor
I love ck 12
Focilia
very helpful
Filden
By providing resources for discussion with my graduate students.
Fernando E.
I have used the lessons to help my ELL's, for introducing lessons, for tutoring, and for enriching my lessons. Thank you!!!
Fernanda S.
The website is great and rich; wonderful resources. My students demand work from the platform and they love the adaptive practice and quizzes. Thank you.
Felix B.
gather information
Felicity
CK-12 has helped my students and I a great deal. First, I would to say my students who use it, love it and have also told me that they have learned how to use to their advantage for their other subjects. Secondly, I love it too. I like that it has great s
Felicia J.
Allow for my students to receive enrichment with the concepts of mathematics.
Fatima P.
It brings new ideas and learning strategies to the table.
Faith W.
TEACHING CHEMISTRY
Fatih
school
Fatima A.
Assistance with after school program
Farae
sience
Faith A.
Instructional texts for students to learn curriculum standards
F Woodall
Thanks for all the content assistance!
Eve S.
Very good resources and excellent lessons.
Erington
Great resources to support MYP curriculum without textbooks
Erin
It has helped me with the additional resources available. They are very useful.
Emma A.
its helps me get better and learn new resources
Eric S.
I have relied on CK-12 for simulators to help my students understand topics that are not able to be done easily in the classroom and has helped them to learn and also saved the school money!! Thank you and happy anniversary!!
Ericka O.
lesson plan for the topic mendel's law of inheritance
Eric C.
Send Geometry support materials
Emmanuel N.
Access to awesome texts for my students!
Emma
I love using the free resources as a literacy component in my science classroom. Many topics that I teach can be found at Ck-12 and the content is both accurate and engaging!
Emily I.
I began homeschooling and immediately went into panic mode, but after another homeschooling mother recommended this site I was immediately put at ease.
Elizabeth S.
I have used articles on a variety of Science topics with students to enhance their understanding
Ela B.
CK-12 has helped me by providing resources to support and reinforce lessons for my middle school students
Elaine H.
As a teacher it provides a resource for my students they may not have thought about. I look forward to seeing what it has to offer.
Ed
ck-12 is an amazing resource that provides up to date information that I can use to supplement our science textbooks. It also has leveled activities which helps when differentiating instruction. Keep up the great work!
Donna N.
I am a first-year chemistry teacher in an under-funded charter school. Our books are almost 10 years old and our lab doesn't have a complete stock. While searching to remedy some of these challenges, I stumbled upon CK-12 which offers a solution to a semi-outdated text and no online option for students who have grown up in the technology age. Thank you for allowing me to add your site as a resource and have options for useful tools to teach my students. Your site helps to make me a better teacher.
Dr K