Welcome to CK-12 Foundation | CK-12 Foundation
Free easy to use tools for you, your teachers and your schools so that you can get your learning done.
Recurso educativo
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Hace 11 años
K-12: Kindergarten (K) for 4–6-year-olds through twelfth grade (12) for 18–19-year-olds.
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Hace 11 años
CK-12 Foundation is a non-profit organization with a mission to reduce the cost of textbook materials for K-12.
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