Khan Academy
ROA Discussion 1, Stocks and Bonds, Finance and Capital Markets
Introduce young economists to the concept of return on assets with this clip, which begins with an overview of various theories on calculating ROA. Sal writes out four formulas and explains why he uses the last one: EBIT divided by...
Math Mammoth
Math Mammoth: Adding and Subtracting Negative Fractions and Decimals, Part 1
In this video, students are shown how to add and subtract negative fractions and decimals. This is followed by an example problem that looks at negative and positive money amounts related to a bank account. [7:09]
Khan Academy
Khan Academy: Arithmetic and Pre Algebra: Adding Decimals of Different Signs
This video shows how to add positive and negative money amounts in the context of a word problem using a number line. Practice problems are available. [3:15]