Free Online Classes & Video Tutorials
A growing number of videos, exercises and lesson plans for self-paced learning.
Featured Video Lessons
SAT Prep
Ratios, rates, and proportions — Basic example
Watch Sal work through a basic Ratios, rates, and proportions problem.
SAT Prep
Solving quadratic equations Basic example
Watch Sal work through a basic Solving quadratic equations problem.
Math
Variables Expressions and Equations
Introduction and examples of variables, expressions and equations
SAT Prep
Reading: Science — How-to Part 1
Watch Sal work through Part 1 of an SAT Reading: Science passage.
Science
Introduction to Evolution and Natural Selection
Introduction to evolution, variation in a population and natural selection
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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