What is unit rate? How is a ratio converted to unit rate? Really, it's just about getting the denominator of a ratio to be 1. When the denominator is 1, the ratio is a unit rate. Check out this video as the instructor illustrates a few...

Here's a real-world word problem. It involves walking for a certain amount of time. There are some given values to use. So take the given values, set up the ratio and then convert that to a unit rate value. Now use this unit rate to get...

This video explains how to convert between customary units of weight/mass. Practice problems are available. [1:34]

This video explains the meaning of various metric measurement unit prefixes and how to convert between them. Practice problems are available. [5:16]

Learn about the mathematics of fencing, including the ratio of touches to time remaining that an athlete needs to mentally calculate in order to stay in the match, in this video from Center for Asian American Media. In the accompanying...

This lesson explains how to convert between units of measurement in the metric system by moving the decimal. It is 1 of 5 in the series titled "Relating Metric System Measures."

This lesson introduces the concept of conversion of squared units between units and systems of measurement. It is 5 of 5 in the series titled "Conversion of Square Units." [2:23]

This lesson [1:14] demonstrates how to rewrite an improper fraction as a mixed number. It is 6 of 19 in the series titled "Converting Improper Fractions."

Students see how to convert between square feet, square yards and square meters. This lesson is 1 of 6 in the series titled "Converting Between Square Feet Yards and Meters." [3:27]

A session of scientific notation practice problems in action. [13:31]

Learn how to multiply and divide numbers that are written in scientific notation. [5:30]

Scientific notation is a way to express very large and small numbers with exponents as a power of ten. In this tutorial, learn to convert numbers into and out of scientific notation. [13:56]

This tutorial explains how to add and subtract numbers written in scientific notation, whether or not they have the same exponent. [7:12]

This tutorial shows how to take a rate, convert it to a unit rate, then use that unit rate to calculate the answer. [3:58]

Video tutorial shows how to convert a rate like 120 miles per 3 hours to the unit rate of 40 miles per hour. [4:26]

Learn the process of turning a repeating decimal into a fraction. [5:08]

Learn to convert US volume measurements, specifically converting gallons to cups. [5:17]

Learn to convert between yards, feet, and inches.

In this lesson, students see how to convert between square miles and square kilometers. [3:18]

In this lesson students see how to convert between square miles and square kilometers.