About Khan Academy
Khan Academy is a nonprofit offering completely free lessons across math, science, economics, history, and test prep. Its short videos and adaptive practice exercises make it a go-to for students, parents, and anyone brushing up on a subject. Everything is free and ad-free, funded by donations.
Key features
- Thousands of free lessons and practice problems
- Adaptive practice that adjusts to your level
- K-12 through early college, plus test prep
- Completely free and ad-free
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