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Khan Academy
Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computing, history, art history, economics, and more, including K-14 and test preparation (SAT, Praxis, LSAT) content. We focus on skill mastery to help learners establish strong foundations, so there's no limit to what they can learn next!
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Resources from Khan Academy
Full-length SAT
Download and take a real, full-length practice test. Watch videos showing step-by-step solutions to problems you missed or found challenging, and get even more practice with unreleased questions from real SATs provided by College Board. After all tha...
Northern Renaissance: the sixteenth century
Discover Grünewald, Bosch, Dürer, Bruegel, Holbein and other extraordinary artists from the Renaissance in England, German, Flanders, etc....
American civics
Sal compares the possible outcomes of the federal budget negotiations around the “fiscal cliff.”...
Instruments of the orchestra
The largest group within the orchestra is comprised of instruments that produce sound from vibrating strings. The vibrations – resulting from the strings being played by a bow, or being plucked with the fingers – resonate within the body of each inst...
Gene regulation
You have tens of thousands of genes in your genome. Does that mean your cells express all of those genes, all the time? Not by a long shot! Even an organism as simple as a bacterium must carefully regulate gene expression, ensuring that the right gen...
Light waves
In these videos and articles you'll learn about the different categories of the electromagnetic spectrum; radio waves, microwaves, infrared, visible, ultraviolet, x-ray, and gamma ray. You'll also learn what it means for light to be polar...
Introduction to algebra
Did you realize that the word 'algebra” comes from Arabic (just like 'algorithm” and 'al jazeera” and 'Aladdin”)? And what is so great about algebra anyway? This tutorial doesn't explore algebra s...
4th grade Math (U.S.)
Want a personalized 4th grade (U.S.) experience? Missions recommend what to learn next, help you remember what you’ve learned by mixing skills, and save your progress....
Addition and subtraction
Fourth grade is the time to really fine-tune your addition and subtraction skills to the point that you can add and subtract pretty much any multi-digit, whole number!...
Immune system physiology
Chances are, you’ve had a fever or a cough at least once in your life (unless you live in a bubble, in which case you should probably go out more!) Have you ever wondered why your body reacts this way? Your body has a deadly arsenal of weapons agains...
Chemistry
We will be covering the material in a first year introductory high school or college general chemistry course. This may be your first time taking chemistry, but chances are you know a lot of chemistry already from observing the world around you. We w...
Shapes
In this tutorial, we'll classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or the presence or absence of angles of a specified size. We'll also learn about special triangles called “...