Khan Academy
Dividing Mixed Numbers, Fractions, Pre-Algebra
Before Sal can divide a mixed number, he has to rewrite it as an improper fraction. He explains that dividing a fraction is the same as multiplying it by its reciprocal and that you can "cancel out" numbers to make multiplying easier.
Khan Academy
Solving Percent Problems, Decimals, Pre-Algebra
Converting percents to decimals, and the other way around, can be tricky. Sal shows young mathematicians how to simplify this process with two sample equations and one word problem.
Khan Academy
Adding Fractions with Like Denominators, Fractions, Pre-Algebra
Show your students this presentation to help them understand how to add fractions with like denominators. Sal adds 3/15 to 7/15 and then simplifies his answer. He uses drawings and multiple colors to show the actual process.
Khan Academy
Multiplying in Scientific Notation (Example), Pre-Algebra
Apply the concept of scientific notation to a word problem involving the rate of speed. Sal explains how to express the answer using scientific notation.
Khan Academy
Multiplying and Dividing Rational Expressions 2, Algebra II
Provide your algebra class with some review of rational expressions in this video. Sal uses several sample problems to demonstrate the process, and his explanations are clear and easy to follow.
California Academy of Science
Desalination
Desalination requires around two gallons of sea water to make one gallon of fresh water—that's quite a ratio! Viewers consider the pros and cons of desalination as one option to providing fresh water. They learn about two different...
California Academy of Science
How Do We Meet the Growing Need for Water?
Some aquifers took thousands of years to collect water, yet they have been depleted in only a hundred years. Viewers learn about where humans use water and the serious concerns for the future of the water supply in the second of 10...
Curated OER
Bonds Vs. Stocks
What's the difference between stocks and bonds? Sal illustrates this concept through explaining the two ways a company can raise capital: debt or equity. Drawing out a balance sheet, he categorizes stocks as equity and bonds as debt,...
Curated OER
Chapter 11: Bankruptcy Restructuring
Continuing from the last clip on liquidation, scholars explore another bankruptcy avenue: restructuring. Sal briefly touches on covenants with debt holders and goes into reasons a company would refrain from liquidating when facing...
Curated OER
Equity vs. Debt
Examine the two ways a company can raise capital: equity and debt. Sal breaks down the differences between these and the pros and cons of the investors. He explains the implications of having a publically traded company and draws a stock...
Curated OER
Going Back to the Till: Series B
Help young economists understand the concept of a company's increasing value despite a lack of profit. They explore Sal's case study startup company, which needs to raise more money after going through the original angel investment. For...
Curated OER
Housing Conundrum (Part 4)
The last of four videos, this clip explains why there were such low default rates at the beginning of the 21st century, and the effect this had on the market. Sal breaks down the options for a homeowner who can no longer pay a mortgage...
Curated OER
Housing Price Conundrum (Part 2)
This second of four videos starts with a short history of the housing market and the conditions that allowed some people to buy, when others could rent. These starting points are a great topic for students to discuss further before...
Curated OER
Housing Price Conundrum (Part 3)
Wondering why home financing relaxed in the years following Y2K? In the third of a four-part series, Sal describes the investment phenomenon between 2000 and 2006 that allowed more people to bid on homes and increased demand...
Curated OER
Inflation, Deflation & Capacity Utilization 2
Sal justifies that the determining factor of inflation and deflation is not the money supply as much as much as it is demand and the raised capacity utilization.
Curated OER
Inflation, Deflation & Capacity Utilization
High utilization of capacity leads to a raise in prices. Salman Khan discusses competition and its effect on inflation.
SciShow
Why We Age - And How We Can Stop It
As we get older, we age, our bodies and minds deteriorate, but this isn't true of all species. The video begins with why we age and what biological processes cause aging. Then it covers research on worms, mice, and other animals that...
California Academy of Science
Waste Water Recycling
What types of water qualify for recycling and how does the recycling process work? The eighth lesson in the 10-part series exploring Fresh Solutions presents both the financial and water savings associated with emerging recycling methods.
California Academy of Science
Recharging Aquifers
The ninth lesson in a 10-part series on Fresh Solutions explains how aquifers develop and how people currently use them. The video also explores how aquifers are being depleted faster than they refill and the long-term concerns about...
California Academy of Science
Water-Wise Farms
The seventh lesson on Fresh Solutions in the 10-part series addresses solutions implemented on farms. It focuses on the options currently in use and hopes for the future of water conservation and farming.
California Academy of Science
Vertical Farming
Half of crops from traditional farming never get harvested, while 90 percent of crops from vertical farming go into the food supply. As land runs out for farming and the need for crops increases, could vertical farming solve the problem?...
California Academy of Science
Renewable Energy: Powered by Poop
A single cow produces more than 100 pounds of manure every day. Meet a farmer using cow manure to provide energy to his farm, electric car, and the larger electric grid. He explains the process and benefits of the renewable energy source.
Into the Outdoors
Into the Outdoors: Technology of Soy
A video investigating the history of the soybean industry. Explore how Henry Ford developed industrial products to grow the soybean industry in the United States. Also included on the site is a lesson plan for teachers to use to view the...
Crash Course
Crash Course Computer Science #39: Educational Technology
This episode talks about how computer science can support learning with educational technology. We here at Crash Course are big fans of interactive in-class learning and hands-on experiences, but we also believe in the additive power of...
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