Free Online Classes & Video Tutorials
A growing number of videos, exercises and lesson plans for self-paced learning.
Featured Video Lessons
Science
Introduction to Evolution and Natural Selection
Introduction to evolution, variation in a population and natural selection
SAT Prep
Ratios, rates, and proportions — Basic example
Watch Sal work through a basic Ratios, rates, and proportions problem.
Math
Euclid as the Father of Geometry
Euclid and his Elements (and how much Abraham Lincoln liked them)
Math
Angle Basics
Definition of an angle. How to denote an angle using points on the angle (including the vertex)
California Standards Test
Algebra I
16 videos
Economics
History
Khan Academy: History of the World
16 videos
Math
Algebra: Introduction to Algebra
4 videos
Algebra: Solving Linear Equations
60 videos
Geometry: Angles
35 videos
Geometry: Basic Geometry
8 videos
SAT Prep
About the SAT
5 videos
Additional Topics in Math
15 videos
Heart of Algebra
18 videos
Passport to Advanced Math
28 videos
Problem Solving & Data Analysis
20 videos
Reading & Writing
43 videos
Science
Khan Academy: Biology
14 videos
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