Khan Academy
Khan Academy: Algebra: More Percent Problems
This video demonstrates how to solve two different word problems involving percents. The first word problem involves buying items on sale for a given percentage. The second word problem involves multiple steps with percent increase and...
Khan Academy
Khan Academy: Differential Equations: Dirac Delta Function
Video first gives an intuition of and defines the Dirac delta function. Includes graphing notation of the Dirac delta function and shows how to shift the Dirac delta function. Gives example of relating a real world scenario to...
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding Mixed Numbers
This video shows how to add two mixed numbers and simplify the result. Practice exercises are available. [2:06]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Gallons to Quarts, Pints, and Cups
This video explains how to convert between customary units of capacity. Practice problems are available. [5:17]
Khan Academy
Khan Academy: Algebra: Converting Gallons to Quarts, Pints, and Cups
A step-by-step breakdown demonstrating how to convert gallons to cups based on conversion equivalences for quarts, pints, and cups. This video also appears n the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [5:17]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Find an Unknown in a Proportion 2
This video shows how to find an unknown quantity in a proportion in the context of a word problem. Practice problems are available. [5:48]
Khan Academy
Khan Academy: Algebra: Find an Unknown Proportion 2
A step-by-step breakdown on how to solve an application problem with an unknown proportion. Practice problems available. This video also appears in the strand Arithmetic and Pre-Algebra: Ratios and Proportions. [5:48]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Dividing Mixed Numbers
This video expains how to divide two mixed numbers and write the answer as a mixed number. Practice problems are available. [2:40]
Khan Academy
Khan Academy: Statistics: Z Statistics vs. T Statistics
Video gives an explanation of the difference between using z-statistics and t-statistics and when each should be used. [6:39]
Khan Academy
Khan Academy: Linear Algebra: Defining the Angle Between Vectors
Video uses the vector triangle inequality and the law of cosines to demonstrate and prove the definition of the angle between vectors. Uses the definition of the angle between vectors to define perpendicular vectors. Shows that the dot...
Khan Academy
Khan Academy: Linear Algebra: Projections Onto Subspaces
A video lesson defining projections onto subspaces. Uses the definition for a projection onto a line and then shows that a generalized version of the formula works for a projection onto any subspace. Includes a concrete example and...
Khan Academy
Khan Academy: Geometry: Quadrilateral Properties
This video tutorial [5:07] demonstrates how to use the basic properties of parallelograms, rectangles, squares, rhombi, and trapezoids to determine what are the possible ways to name a given geometric shape.
Khan Academy
Khan Academy: Algebra: Word Problem Solving 4
This video demonstrates how to solve two different word problems that involve linear relationships. In order to solve the problem an equation must be written and then the video demonstrates how to solve for a particular variable in the...
Khan Academy
Khan Academy: Geometry: Inradius Perimeter and Area
Proof that the area of a triangle is equal to half the inradius times the perimeter of the triangle, or the area is equal to the inradius times the semiperimeter. This video also appears in the Geometry: Circles strand. [7:29]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Associative Law of Multiplication
This video shows the associative law of multiplication by grouping numbers in different ways. Practice problems are available. [2:15]
Khan Academy
Khan Academy: Algebra: Solving Rational Equations 3
A step-by-step breakdown on how to solve a rational equation with constraints with more than one solution. [4:32]
Khan Academy
Khan Academy: Algebra: Subtracting Polynomials
Demonstrates how to subtract one polynomial from another polynomial by adding the opposite of the second polynomial. [2:07]
Khan Academy
Khan Academy: Geometry: Area of Koch Snowflake (Part 1) Advanced
Demonstrates how to find the area of a Koch snowflake by summing an infinite geometric series based on the area of an equilateral triangle. [12:30]
Khan Academy
Khan Academy: Algebra: Multiplying in Scientific Notation
Video showing how to multiply three numbers written in scientific notation. [7:35]
Khan Academy
Khan Academy: Linear Algebra: Deriving a Method for Determining Inverses
An instructional video that explains how the method for finding the inverse transformation matrix is derived. It is the same method for finding the inverse for any invertible matrix. [18:00]
Khan Academy
Khan Academy: Algebra: Partial Fractions Expansion 2
Video demonstrates how to perform partial fraction expansion on a given rational expression. In the given expression, the degree of the numerator is less than the degree of the denominator. The denominator is a difference of cubes. [13:02]
Khan Academy
Khan Academy: Algebra: Conic Sections: Iit Jee Circle Hyperbola Intersection
An instructional video that presents the solution to an IIT JEE problem about the intersection points of a circle and a hyperbola. Students must find the intersection points and then determine the equation for a circle whose diameter is...
Khan Academy
Khan Academy: Pre Calculus: Vi and Sal Talk About the Mysteries of Benford's Law
A video in which Benford's Law is described briefly and shown graphically. A couple of real-world examples are given in which the data follows Benford's Law. Students are motivated to think about why Benford's Law works. [8:04]
Khan Academy
Khan Academy: Algebra: Graphing Using X and Y Intercepts
This video demonstrates how to find the x and y intercepts of a line given the equation of the line. The video also shows how to graph the line on a coordinate plane after the x and y intercepts are determined. Practice problems...