Khan Academy
Khan Academy still free, now reimagined!
Check out what's now available for US teachers at khanacademy.org.
We shared the buzz with educators here at the #ISTELive26 conference floor and teacher...
Learn about analyzing proportionality using equations and tables in a distance scenario.
Learn to make connections between equations and tables in proportional relationships.
Students learn that two figures may have either corresponding side lengths with equivalent ratios OR corresponding angle measures equal, and still NOT be scaled copies. We must see that both charac...
Students learn to compare two scale drawings of the same object made with different scales. Identify how the lengths, widths, or areas change as the scale changes.
Explore how scale factors relate in scaled copies. Learn why the scale factor from the copy back to the original is the reciprocal of the scale factor from the original to the copy.
Learn how to identify equivalent scales with different units.
Learn how to compare scales that have different units.
Learn how to write scales with and without units.
Students learn to compare two scale drawings of the same object made with different scales. Identify how the lengths, widths, or areas change as the scale changes.
Learn how to find the measurements of distances on scaled figures that are not side lengths.
In the 1800s, scientists began noticing that some continents fit together like the pieces of a jigsaw puzzle. This led to speculations that the continents were once connected, but moved apart. Evid...
Earth is the perfect planet for life as we know it! It orbits the Sun in the habitable zone, where planetary temperatures allow water to exist as a liquid. Scientists believe this is important beca...
There are many other objects in orbit around the Sun than the eight major planets. There are comets, asteroids, meteoroids, and dwarf planets such as Pluto and Eris. There’s the asteroid belt betwe...
A region’s geological activity is often determined by the different plate boundaries below that region. Divergent boundaries occur when plates are moving away from each other. These regions are kno...
The Sun is the star at the center of our solar system. There are eight major planets in orbit around the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Each has its own int...
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!
Examine how metallic bonding explains the key properties of metals. Delocalized electrons enable stron...
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now!
Explore how electron arrangement determines the behavior of nonmetals and metalloids. Nonmetals form co...
Much like a peach, Earth is divided into layers. The thinnest layer is the crust, which composes all the continents and ocean basins. The crust is divided into several massive tectonic plates. Bene...
Earth’s tides are caused by the gravitational attraction of the Moon and Earth. This net force creates a tidal bulge that moves across Earth’s oceans, creating predictable cycles of low and high t...