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Relate addition and subtraction
By Khan Academy
See the relationship between 2+3=5, 5-2=3, and 5-3=2.
Basic rate problems
By Khan Academy
Finding a unit rate is a skill often required in real life. How fast is that plane flying? How many lawns can you mow in an afternoon? You see, with our knowledge of ratios and fractions, we can now solve unit rates problems like this.
Simple probability
By Khan Academy
In order to find the probability of picking a yellow marble from a bag, we have to first determine the number of possible outcomes and how then many of them meet our constraints.
Simple probability
By Khan Academy
In this example we are figuring out the probability of randomly picking a non-blue marble from a bag. Again, we'll have to think about the possible outcomes first.
Using the quadratic formula
By Khan Academy
Sal rewrites the equation 6x^2+3=2x-6 in standard form and identifies a, b, and c, that can later be used within the quadratic formula.
Rewriting and interpreting exponential functions
By Khan Academy
Sal solves two word problems: one about a radioactive decay, and the other the exponential growth of a fast-food chain.
Advanced reflections
By Khan Academy
Sal is given two line segments on the coordinate plane and the definition of a translation, and he draws the image of the segments under that reflection.
Pythagorean theorem and the equation of a circle
By Khan Academy
Pythagorean theorem and the equation of a circle