Free Online Classes & Video Tutorials
A growing number of videos, exercises and lesson plans for self-paced learning.
The majority of video content on this page is provided by Khan Academy, a nonprofit organization with a mission to provide a free, world-class education for anyone, anywhere.
We are deeply grateful to Khan Academy for making these educational resources freely available to learners worldwide. Visit Khan Academy →
Featured Video Lessons
Introduction to Evolution and Natural Selection
Introduction to evolution, variation in a population and natural selection
Variables Expressions and Equations
Introduction and examples of variables, expressions and equations
Euclid as the Father of Geometry
Euclid and his Elements (and how much Abraham Lincoln liked them)
Reading: Science — How-to Part 1
Watch Sal work through Part 1 of an SAT Reading: Science passage.
CA Algebra I: Number Properties and Absolute Value
1-7, number properties and absolute value equations
Algebra I
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Khan Academy: History of the World
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Algebra: Introduction to Algebra
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Algebra: Solving Linear Equations
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Geometry: Angles
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Geometry: Basic Geometry
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About the SAT
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Additional Topics in Math
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Heart of Algebra
18 videos
Passport to Advanced Math
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Problem Solving & Data Analysis
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Reading & Writing
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Khan Academy: Biology
14 videos