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Math and science made easy to understand, from Kindergarten to college: 3,183 lessons with pictures you can move and every step shown.
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Science
Math
Engineering
Pictures you can move
Mechanics of Materials (Solid Mechanics I)
Shear and moment of a uniform load
Drag the cut along the beam: the shear and bending moment there follow on the diagrams.
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Grade 11 · Science
Motion in two dimensions: vectors and projectile motion
Drag the launch arrow: change the angle and speed and watch the path.
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Grade 11 · Math
The unit circle and radian measure
Drag the point around the circle: sine and cosine follow.
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Calculus I
Derivatives and differentiation rules
Drag the point along the curve: the tangent line shows the slope there.
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Explore
Kindergarten to Grade 12
Math and science for every grade, skill by skill.
College
University math, science and engineering courses.
How it works
1. Find your lesson
Pick a grade or a course, or type a problem from your homework and Search finds the lesson that solves it.
2. Put in your numbers
Type what you know. Every step is worked out for you, with the rule and the numbers.
3. Move the picture
Drag the picture and watch the numbers change, until the idea makes sense.
Try a lesson
Add and subtract within 20
Grade 1 · Math
Pythagorean theorem and distance between points
Grade 8 · Math
Momentum, impulse and collisions
Grade 11 · Science
Ohm's and Kirchhoff's laws
Topic · Circuit Analysis I
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