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This video covers how to calculate percents of change by demonstrating how to calculate a price change. Just divide the price decrease by the origi...

Larry, el cangrejo, necesita un nuevo controlador para su Lbox y le gustaría saber que tan barato lo pudiera comprar ahora, a diferencia de hace a...

CAHSEE Math: Algebra I Drill 6, Problem 3. If x ounces of a 10% salt solution are added with 20 ounces of a 50% salt solution to create a comb...

Looking to con someone out of 40% of a pizza? You've come to the right place. Just don't try that on us.

Converting percents to decimals is easy: just move the decimal point two to the left. Yep, that's it. To the left, to the left... convertin' th...

If the value of a painting increases by 15 percent every year, what was it worth 5 years ago? Hold up: why would you want to sell it now? In a few...

This video covers how to use cross products to solve for a missing number in a proportion by setting that proportion with a variable over the produ...

ACT Math: Pre-Algebra Drill 1.2. What proportion of Jenna's day is spent Wii-swimming?

ACT Math: Pre-Algebra Drill 5, Problem 5. How many red cards must be added so that the proportion of red cards is one half?

There's a 99% chance you'll love this video.

Some people are just so...proportional. Might it be due to their proportional similarity to the Golden Ratio? Next time you notice your cute lab pa...

ACT Math: Pre-Algebra Drill 4, Problem 4. Using the information given, find out how many girls attend the school.

Approximately 874 people per day wonder what a unit rate is. If you're one of them, check out our video on unit rates and how to use them. (We just...

Algebra and Functions: Drill Set 6, Problem 3. How many fritters are made during the typical breakfast hours between 6:00AM and 11:30AM at thi...

Algebra and Functions: Drill Set 6, Problem 4. How many miles can Karen run in 12.5 minutes?