Sal begins this video by "massaging the equations slightly to prepare them for elimination." The equations won't be the only relaxed part of this lesson, which introduces the concept of multiplication to systems of equations. Viewers...

Change places by pivoting the figure. The section of a geometry playlist introduces rotations by making the connection to rotational symmetry. The presentation provides formulas to use with the coordinates when rotating a figure around...

You're trapped in a dark castle with a pile of gold coins that a wizard will only allow you to leave with if you can solve his riddle. Math learners solve the riddle of the dark coin with the help of an engaging instructional video.

Here's help in making the giant leap from finding real to finding complex roots. Careful and thorough in explanation, the theory of polynomial algebra is briefly touched upon before the examples really dive into the application...

Where many multiplying binomial lessons introduce the tool of FOIL and move on, this video presentation really delves into the how's and why's of the distributive property. Careful treatment of distribution and explicitly written out...

One of the strongest tools an algebra learner develops is the ability to quickly and accurately graph almost any given function. Often doing this quickly and accurately requires rigid transformations to a parent function,...

Finding a unit rate is imperative to the smart shopper! A video lesson introduces learners to a comparison of ratios. Initially, the instructor manipulates the ratios to have a common denominator for better comparison. He then explains...

Explaining the hows and whys of exponent laws in an approachable and non-intimidating manner is no small task. But here, it is accomplished with humor and real-life examples. Set up with scenarios from biology, the role of exponents and...

Upper level math doesn't have to be unapproachable. An instructional video uses virtual manipulatives to demonstrate the meaning of a permutation, a combination, and factorial.    

A brief presentation with laser-like focus, this video talks young mathematicians through the mechanics of simplifying algebraic fractions by factoring trinomials. While the factoring itself is assumed to be a mastered skill, the...

Some foods we eat are not meant to be broken down by our digestive systems, but instead by our gut. But how can we control what our gut breaks down? The answer is simple: our diet.

Discover the peculiar geometric property of the curve of constant width, the Reuleaux triangle, and their intriguing connection to manhole covers with yet another fascinating TED-Ed video. 

Build fluency with manipulating equations with a video lesson that demonstrates the process of solving for different variables within an equation. The instructor shows three examples with a different variable isolated in each, which...

This lesson provides real-world examples that demonstrate how to organize data into matrices. It is 4 of 5 in the series titled "Using Matrices to Organize Data." [8:40]

This lesson provides real-world examples that demonstrate how to organize data into matrices. It is 3 of 5 in the series titled "Using Matrices to Organize Data." [4:43]

This lesson provides real-world examples that demonstrate how to organize data into matrices. It is 5 of 5 in the series titled "Using Matrices to Organize Data." [2:51]

After viewing video components, students use manipulatives to work with the famous Towers of Hanoi problem. The goal is for learners to begin to understand recursive logic and thinking, relevant to computer scientists, mathematicians,...

Video lesson about how orthogonal matrices preserve lengths and angles of vectors when multiplied. Preservation of lengths is shown by manipulating the length of the square of an orthogonal matrix times a vector and preservation of...