Ratio & Rate

Khan: Speed

Remember speed? You know, everyone's favorite rate? Check out this video for a refresher and practice problems.

Finding average speed or rate: Using the formula for finding distance we can determine Usian Bolt's average speed, or rate, when he broke the world record in 2009 in the 100m. Watch.

Khan: Intro to Ratio

Introduction to ratios: Your weedeater instructions tell you to put a fuel mixture of gas and oil in the engine, and that ratio is 40:1. What does that mean? Ratios give us the relationship between quantities of two different things.