Listen to a master craftsman explain many of the ways that mathematics is used in woodworking, including number operations; geometry; ratios and proportions; and measurement. In the accompanying activity, students will draw a scale...

This "I <3 Math" episode uses real-world comparisons to convert rates into equivalent percentages.

This "I <3 Math" episode defines unit rates and discusses their relationship to ratios. [2:01]

This video is an introduction to the concept of ratios that provides real-world examples. This "I <3 Math" episode defines ratios, discusses combining ratios, and demonstrates the correct ways to write ratios. [2:37]

This video series introduces key Common Core concepts in 4th-8th grade mathematics. Each video focuses on building a conceptual understanding of a topic so that students understand the "how" and "why" behind mathematical problem-solving.

Learn how understanding distance--both lunge distance and the distance between you and your opponent--is an important strategy in the art of fencing. This clip is from the Center for Asian American Media. In the accompanying classroom...

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...

In this video, learn how mathematics--specifically, proportion, ratio, rate, and conversions--are used in the professional responsibilities of a registered nurse working on the surgical trauma floor. In the accompanying classroom...

This QuickTime movie gives examples of writing ratios. As you watch and listen to the teacher and students interact it helps clarify the thinking behind applying this concept.

Videos offering step-by-step solutions to problems involving ratios. A math teacher and students will show you how to figure out answers to "write the ratio 16 to 48 as a fraction in lowest terms," "give the ratio of 2/3 to 4/9 as a...

Determine the unit rate of items and the price per item.

Explore ratios and proportional reasoning by watching a date turn bad.

This lesson demonstrates how to simplify ratios containing measurements. Students can watch a video tutorial and then take an online quiz.

The algebra resource demonstrates how to solve advanced ratio problems. Students learn about the concept through a video tutorial. [9:58]

A step-by-step instructional video on how to solve a ratio problem.

This video solves a problem involving ratio and proportions.

The algebra resource demonstrates how to find an alternate solution to an advanced ratio problem. Students learn about the concept through a video tutorial. [7:02]

A basic introduction to ratios and how to calculate them. [3:58]

Ratios are everywhere. Watch this video tutorial to learn about them. [1:13]

This tutorial demonstrates how to use the scale from a blueprint of a house to help find the actual height of the house by using a proportion to solve. [2:29]

Video demonstrates how to find an unknown in a proportion three different ways..

The algebra resource demonstrates how to solve ratio problems. Students learn about the concept through a video tutorial. [5:12]

A step-by-step breakdown on how to solve ratio problems with algebra.

This video shows how to determine if a given proportion is true or false.