free online textbooks, flashcards, adaptive practice, real world examples, simulations
ck-12 foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history
Ranked 17140 globally, ck12.org welcomes 50 visitors each month. It holds the 624 position in the Education category. Discover what makes ck12.org a valued resource in the Education community.