Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Comparing Fractions 2
This video shows how to compare two fractions using a several methods. Practice problems are available. [7:08]
Khan Academy
Khan Academy: Algebra: Graphing Inequalities 1
This video demonstrates how to determine if a set of ordered pairs is a solution to a two variable inequality. First the video shows how to plug the ordered pair into the inequality and solve, then the video demonstrates how to graph the...
Khan Academy
Khan Academy: Algebra: Rational Inequalities 2
A step-by-step breakdown on how to solve a rational inequality. [13:15]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Rounding Whole Numbers 3
This video shows how to round a 4-digit number to the nearest ten. Practice problems are available. [1:04]
Khan Academy
Khan Academy: Geometry: Three Points Defining a Circle
Demonstates that any three non-collinear points can be used to define a unique triangle with a unique circumcenter and circumradius. These, in turn, define a unique circle. The center of the circle is the circumcenter of the triangle....
Khan Academy
Khan Academy: Algebra: Conic Sections: Three Points Defining a Circle
A video lesson that describes how any three non-collinear points actually define a circle. First it is shown that three points define a triangle. Then it is shown that the circumcenter of that triangle is actually the center of the...
Khan Academy
Khan Academy: Algebra: X and Y Intercepts 2
This video demonstrates how to find the x and y intercepts given a linear equation. Once the intercepts are found it also shows how to graph the line on a coordinate plane. Practice problems available. [3:25]
Khan Academy
Khan Academy: Chemistry: Le Chatelier's Principle
A video lecture explaining Le Chatelier's Principle. The video shows how a reaction will favor one side of the reaction when stressed. [14:43]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding and Subtracting Fractions
This video shows how to add and subtract fractions with like and unlike denominators. Practice problems are available. [9:49]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Understanding Exponents 2
This video explains how to find the value of a number written in exponential notation. Practice problems are available. [1:15]
Khan Academy
Khan Academy: Geometry: Ca Geometry: Pythagorean Theorem, Compass Constructions
This video tutorial demonstrates solutions to problems #51-55 of the California Geometry released state test questions. Problems address proving and using the Pythagorean theorem and compass constructions. [12:35]
Khan Academy
Khan Academy: Algebra: Scientific Notation I
Video explaining scientific notation and negative exponents and then writing an example of a very small number in scientific notation. [4:12]
Khan Academy
Khan Academy: Linear Algebra: Invertibility Implies a Unique Solution to F(x)=y
Video first reviews what it means for a function to be invertible. Shows that if a function is invertible then there is a unique solution to f(x) = y. Also shows that if there is a unique solution to the equation f(x) = y for all y then...
Khan Academy
Khan Academy: Linear Algebra: Matrix Vector Products
Video starts with reviewing matrix notation. Defines multiplying a matrix by a vector and shows examples. Shows how the matrix-vector products can be interpreted as the dot product of column vectors with a matrix or as a weighted linear...
Khan Academy
Khan Academy: Algebra: Dividing Polynomials 1
Video demonstrates how to divide a trinomial by a binomial. [3:20]
Khan Academy
Khan Academy: Geometry: Measuring Angles in Degrees
Explains how to measure an angle in degrees using a protractor. Defines acute, right, and obtuse angles. Practice problems available. [8:22]