Title  Description  Thumbnail Image 

Why Do Elephants Have Wrinkled Skin? 
Have you noticed how wrinkled an elephant's skin is? What purpose does it serve and what does math have to do with explaining this phenomenon? Well, the explanation for an elephant's wrinkled skin is almost entirely a math story. In this module students explore rational expressions and functions in the context of the ratio of surface area and volume for various threedimensional figures. Such figures can be used to model the basic shapes of animals. This ratio reveals a lot about how an animal is able to retain heat or lose it rapidly, depending on the animal's habitat. The geometry of heat transfer also has applications in architecture and design. What your students will learn:
Make sure your students know the basics of rational numbers and functions. 

Slope and Grade 
In this lesson students learn how to use the slope formula to calculate steepness. In particular, students learn how to calculate steepness in the context of cycling. Cyclists use a measure called grade to calculate the steepness of a hill or mountain. Students apply their knowledge of slope to the concept of grade. 

VIDEO: Brief Review: Adding and Subtracting Rational Numbers 
In this Brief Review, the addition and subtraction of rational numbers is explored. Note: The download is an MP4 file. 

VIDEO: Brief Review: Applications of Rational Numbers 
In this Brief Review, applications of rational numbers are explored. Note: The download is an MP4 file. 

VIDEO: Brief Review: Multiplying Rational Numbers 
In this Brief Review, multiplying rational numbers is explored. Note: The download is an MP4 file. 

Closed Captioned Video: Rational Numbers: Rational Numbers on the Cartesian Coordinate System 
Video Tutorial: Rational Numbers: Rational Numbers on the Cartesian Coordinate System. In this video, students learn to graph rationalnumberbased coordinates on a Cartesian Coordinate plane. A Video Transcript is available for this tutorial at this Link Note: The download is Media4Math's guide to closed captioned videos. Other Closed Captioned VideosTo see the complete collection of Closed Captioned Videos, click on this Link 

Closed Captioned Video: Rational Numbers: Subtracting Rational Numbers 
Video Tutorial: Rational Numbers: Subtracting Rational Numbers. In this video, students learn to subtract rational numbers. A Video Transcript is available for this tutorial at this Link Note: The download is Media4Math's guide to closed captioned videos. Other Closed Captioned VideosTo see the complete collection of Closed Captioned Videos, click on this Link 

Closed Captioned Video: Rational Numbers: Variable Expressions with Rational Numbers 
Video Tutorial: Rational Numbers: Variable Expressions with Rational Numbers. In this video, students simplify various variable expressions that use rational numbers. A Video Transcript is available for this tutorial at this Link Note: The download is Media4Math's guide to closed captioned videos. Other Closed Captioned VideosTo see the complete collection of Closed Captioned Videos, click on this Link 

Closed Captioned Video: Rational Numbers: What Are Rational Numbers? 
Video Tutorial: Rational Numbers: What Are Rational Numbers? In this video, students learn the basic definition of rational numbers and look at realworld applications of them. A Video Transcript is available for this tutorial at this Link Note: The download is Media4Math's guide to closed captioned videos. Other Closed Captioned VideosTo see the complete collection of Closed Captioned Videos, click on this Link 

DefinitionRational Numbers 
The definition of the term "Rational Numbers." Note: The download is a JPG file. Related ResourcesTo see the complete collection of glossary terms in the Visual Glossary, click on this link: https://media4math.com/VisualGlossary 

INSTRUCTIONAL RESOURCE: Adding and Subtracting Rational Numbers 
In this Slide Show, learn how to add and subtract rational numbers. Includes links to several Media4Math videos and a math game. Note: The download is a PPT file. 

Video Transcript: Rational Numbers: Rational Numbers On a Number Line 
This is the transcript that goes with the video segment entitled Video Tutorial: Rational Numbers: Rational Numbers On a Number Line. To access the corresponding Video Tutorial, click here: https://media4math.com/library/videotutorialrationalnumbersrationalnumbersnumberline 

Video Transcript: Rational Numbers: Rational Numbers On the Cartesian Coordinate System 
This is the transcript that goes with the video segment entitled Video Tutorial: Rational Numbers: Rational Numbers On the Cartesian Coordinate System. To access the corresponding Video Tutorial, click here: https://media4math.com/library/videotutorialrationalnumbersrationalnumberscartesiancoordinatesystem 

Video Transcript: Rational Numbers: Subtracting Rational Numbers 
This is the transcript that goes with the video segment entitled Video Tutorial: Rational Numbers: Subtracting Rational Numbers. To access the corresponding Video Tutorial, click here: https://media4math.com/library/videotutorialrationalnumberssubtractingrationalnumbers 

Video Transcript: Rational Numbers: Variable Expressions with Rational Numbers 
This is the transcript that goes with the video segment entitled Video Tutorial: Rational Numbers: Variable Expressions with Rational Numbers. To access the corresponding Video Tutorial, click here: https://media4math.com/library/videotutorialrationalnumbersvariableexpressionsrationalnumbers 

Video Transcript: Rational Numbers: What Are Rational Numbers? 
This is the transcript that goes with the video segment entitled Video Tutorial: Rational Numbers: What Are Rational Numbers? To access the corresponding Video Tutorial, click here: https://media4math.com/library/videotutorialrationalnumberswhatarerationalnumbers 

Video Tutorial: Rational Numbers: Rational Numbers on the Cartesian Coordinate System 
Video Tutorial: Rational Numbers: Rational Numbers on the Cartesian Coordinate System. In this video, students learn to graph rationalnumberbased coordinates on a Cartesian Coordinate plane. A Video Transcript is available for this tutorial at this link: Link Note: The download is an MP4 file. Related ResourcesTo see the complete collection of Videos on this topic, click on this link: https://bit.ly/3eZIU07 

Video Tutorial: Rational Numbers: Subtracting Rational Numbers 
Video Tutorial: Rational Numbers: Subtracting Rational Numbers. In this video, students learn to subtract rational numbers. A Video Transcript is available for this tutorial at this link: Link Note: The download is an MP4 file. Related ResourcesTo see the complete collection of Videos on this topic, click on this link: https://bit.ly/3eZIU07 

Video Tutorial: Rational Numbers: Variable Expressions with Rational Numbers 
Video Tutorial: Rational Numbers: Variable Expressions with Rational Numbers. In this video, students simplify various variable expressions that use rational numbers. A Video Transcript is available for this tutorial at this link: Link Note: The download is an MP4 file. Related ResourcesTo see the complete collection of Videos on this topic, click on this link: https://bit.ly/3eZIU07 

Video Tutorial: Rational Numbers: What Are Rational Numbers? 
Video Tutorial: Rational Numbers: What Are Rational Numbers? In this video, students learn the basic definition of rational numbers and look at realworld applications of them. A Video Transcript is available for this tutorial at this link: Link Note: The download is an MP4 file. Related ResourcesTo see the complete collection of Videos on this topic, click on this link: https://bit.ly/3eZIU07 