FlexBook® 2.0 Platform


CK-12’s FlexBook® 2.0 Platform offers interactive, integrated, and insightful functionality enabling a student’s personalized journey.

The CK-12 FlexBook® Platform incorporates:

  • interactive lessons with PLIX and Simulations, inline questions, and videos
  • Adaptive Practice for each lesson
  • curated related modalities
  • teacher Insights on student performance
  • customization tools
  • access on ANY device: smartphone, Chromebook, tablet, laptop, or desktop
Browse FlexBooks® 2.0

Concept-Based Learning


CK-12’s Concept Pages offer a wide variety of STEM content allowing students to “learn it their way” and teachers to “teach it their way.”

Concept-based learning offers:

  • multiple modalities, including lessons, videos, interactives, real world applications, study guides, and adaptive practice
  • content at basic, at grade, and advanced levels
  • concepts spanning multiple courses
  • easy ways to address different learning styles
Browse CK-12 Concepts

Adaptive Practice


CK-12’s Adaptive Practice helps students learn in a way never before imaginable. Using machine learning, students practice, learn, and fill in their knowledge gaps.

CK-12’s Adaptive Practice works by:

  • selecting individualized questions from CK-12’s library of over 150,000 questions
  • offering questions at a lower level, or from a prerequisite concept, if a student is struggling
  • advancing the student to the next concept if they’re getting questions correct
  • suggesting personalized CK-12 content based on a student’s need
  • showing student progress in the Dashboard
Try CK-12 Adaptive Practice



CK-12’s PLIX Interactives and Simulations enable students to experience concepts in a new and exciting way. Concepts come alive as students explore and interact with them.


  • These interactives have students “Play, Learn, Interact, and eXplore” a single concept.
  • CK-12 has over 1,200 math and science interactive PLIX.
  • Each PLIX offers:
    – a simple exploration of a single concept
    – follow up questions with hints
    – open discussion questions for higher-level thinking
    – links to online discussions and relevant materials


  • CK-12 has over 100 Physics and Chemistry Simulations.
  • Each Simulation is:
    – built upon everyday examples, not laboratory models
    – equipped with interactive sliders and responsive graphs
    – aligned to Next Generation Science Standards (NGSS)
Browse CK-12 PLIX Browse CK-12 Simulations



CK-12’s Classes allow teachers to assign and monitor student learning and progress. They can be set up for the entire class or differentiated groups to get students the personalized content they need.

CK-12 Classes are:

  • teacher-directed
  • for a whole class or smaller, differentiated groups to personalize learning
  • a way to give assignments to specific groups, including:
    – lessons
    – interactives
    – videos
    – adaptive practice
Try CK-12 Classes

CK-12 Cafe Forums


The CK-12 Cafe is a place for the community to share thoughts and advice. From students getting help on homework to teachers sharing about the classroom, these forums are all about ideas.

Student forums provide a platform to:

  • get homework help
  • answer questions from other students, teachers, and experts
  • explore CK-12’s Questions of the Week
  • pose “I wonder” questions

Teacher forums provide a platform to:

  • discuss CK-12 resources in the classroom
  • extend learning from the Certified Educator Program
  • connect with local teachers and administrators in the specific state forums
Browse CK-12 Cafe

LMS Integration


CK-12 facilitates integration with a variety of Single Sign-On (SSO) and Learning Management System (LMS) partners, including Google Classroom, Canvas, Schoology, Kiddom, Clever, and ClassLink.