Explains how to use given triangle congruency statements to determine the unknown measures of all angles in a diagram where one large triangle is divided into three congruent triangles. [4:35]

Demonstrates how to add polynomials. Each polynomial is a trinomial. Practice problems available. [2:01]

This video demonstrates how to solve a word problem using an expression and substituting values for a variable. [2:00]

This video covers a short review of addition, followed by basic subtraction concepts. Practice problems are available. [8:32]

Video explains and uses the quotient of powers rule as well as working with algebraic expressions with negative exponents. Video is also included in the Algebra: ck12.org strand. [9:22]

This video shows how to write a decimal in word form, using place value concepts. Practice problems are available. [3:31]

This video introduces basic addition concepts using objects and number lines to represent and add numbers. Practice problems are available. [7:42]

A step-by-step breakdown on how to solve a rational equation in a real-world application problem. [7:59]

A video that demonstrates how to solve linear equations of the form Ax=B. There are three examples that vary using whole numbers and positive and negative fractions. [7:28]

Video explains how to find special binomial products. Four examples are worked that show how to square a binomial. Three examples are worked that show the product of a sum and a difference (a +b)(a - b). This video also appears in the...

John Green discusses what is arguably the most revolutionary of modern revolutions, the Industrial Revolution. [11:04]

This video describes three factors for the acceleration of change: interconnected world zones, increasing commerce and markets, and new sources of fossil fuel energy. These factors led to the modernization of society in some parts of the...

This video looks at three forces of change that gather momentum and help create the modern world, transforming the biosphere. [11:22]

Historians ask questions about the past to help understand the present and gain insight into the future. Listen to a history professor from the University of Michigan discuss how and why he studies history.

Video tutorial explains the photoelectric effect using wave-particle duality, the work function of a metal, and how to calculate the velocity of a photoelectron. [10:23]

Learn the basics of the deficit, debt and debt ceiling and what happens if the government defaults on its obligations in this Kahn Academy video. [9:57]

In this video [2:55] hear the origin story of the Hindu deity Ganesha and learn how to identify depictions of Ganesha with the use of artworks in the Asian Art Museum's collection. Ganesh is the son of Shiva and Parvati; he"s worshiped...

This video lesson from Khan Academy discusses the US President's bully pit. This lesson is intended for students taking high school or college level American Government and Civics courses, including the AP Government course.

This video lesson from Khan Academy features John Dickerson, co-host of CBS This Morning. Dickerson discusses the history and the significance of the Articles of Confederation. This lesson is intended for students taking high school or...

This video lesson from Khan Academy provides an introduction to the Articles of Confederation and its weaknesses. Shays' Rebellion was one of the catalysts for the Constitutional Convention of 1787. This lesson is intended for students...

Explains what is meant by Chapter 7 and Chapter 13 personal bankruptcy.

Basics of 'for' loops in the Python programming language.

Explains how the inheritance tax on an estate is calculated.

Explains how mortgage interest rates are calculated.