Khan Academy on a Stick
Ratios, proportions, units and rates

Introduction to Ratios (new HD version)
cc
What a ratio is. Simple ratio problems.

Ratios as Fractions in Simplest Form
cc
Ratios as Fractions in Simplest Form

Simplifying Rates and Ratios
cc
Simplifying Rates and Ratios

Ratio word problem exercise example 1
cc
 Ratio word problem exercise example 2

Proportion validity example
cc
Understanding Proportions
Ratios and proportions
Would you rather go to a college with a high teachertostudent ratio or a low one? What about the ratio of girlstoboys? What is the ratio of eggs to butter in your favorite dessert? Ratios show up EVERYWHERE in life. This tutorial introduces you to what they (and proportions) are and how to make good use of them!

Usain Bolt's Average Speed
Figuring out Usain Bolt's average speed over 100m when he broke the world record in 2009

Finding Unit Rates
cc
Finding Unit Rates

Finding Unit Prices
cc
Finding Unit Prices
 Multiple rates word problem
Rates
How fast can a robot possum fly? What is the rate at which a hungry you can consume avocados? This tutorial helps you make sense of these fundamental questions in life.

Converting pounds to ounces
cc
Converting pounds to ounces

Converting Gallons to quarts pints and cups
cc
Converting Gallons to quarts pints and cups

Converting Yards into Inches
cc
U06_L1_T1_we1 Converting Yards into Inches

Performing arithmetic calculations on units of volume
cc
Performing arithmetic calculations on units of volume

Application problems involving units of weight
cc
Application problems involving units of weight

Solving application problems involving units of volume
cc
Solving application problems involving units of volume
 Gas cost for a roadtrip
 Squirrel survival

Converting units of length
cc
Converting units of length

Unit Conversion Example: Drug Dosage
cc
Unit Conversion Example: Drug Dosage

Unit Conversion with Fractions
cc
Unit Conversion with Fractions

Speed translation
cc
Translating speed units
Unit conversion
Wait, I'm in Europe and my car only tells my distance traveled in kilometers! But I'm used to a units of distance devised by the Romans to measure the average length of 1000 paces of a soldier (the "mile")! How do I operate? This tutorial is about the fundamental skill of unit conversion. Sal's cousin Nadia being a bit confused with this was actually the reason why he started tutoring her (which led to the creation of the Khan Academy).

Unit conversion within the metric system
cc
Metric unit conversion

Converting within the metric system
cc
Converting within the metric system

Perimeter and Unit Conversion
cc
Perimeter and Unit Conversion

Applying the Metric System
cc
U06_L2_T3_we1 Applying the Metric System

Conversion between metric units
cc
Conversion between metric units

U.S. Customary and Metric units
cc
U.S. Customary and Metric units
Metric system unit conversion
If you're American, you might be surprised to realize that the rest of the world doesn't use feet, miles, or yards or a bunch of other "English System" conventions (the irony being that the English don't even use the "English System" any more). Most everyone else, including the English, now use the metric system which is actually much more logical. So be prepared to learn about kilo and milli and centi and become a metric unit megastar!

Converting Fahrenheit to Celsius
cc
Converting Fahrenheit to Celsius

Comparing Celsius and Farenheit temperature scales
cc
Comparing Celsius and Farenheit temperature scales
Farenheit and Celsius conversion
There are three major conventions for measuring temperature in the world, Farenheit, Celsius and Kelvin. If converting between the three gives you cold feet, then this tutorial might warm them up.