CK-12
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CK-12 provides free access to open-source content and technology tools that empower students as well as teachers to enhance and experiment with different learning styles, resources, levels of competence, and circumstances.
Science
- Physics
- Chemistry
- Biology
- Physical Science
- Life Science
- Earth Science
- 5th Grade Science
- 4th Grade Science
- 3rd Grade Science
- 2nd Grade Science
- 1st Grade Science
- Kindergarten Science
Math
- PreCalculus
- Algebra 2
- Geometry
- Algebra 1
- 8th Grade Math
- 7th Grade Math
- 6th Grade Math
- 5th Grade Math
- 4th Grade Math
- 3rd Grade Math
- 2nd Grade Math
- 1st Grade Math
Social Studies
- Economics
- Geography
- Government
- History
- World History
- Philosophy
- Sociology
Category