Title  Description  Thumbnail Image  Curriculum Topics 

Construction Site Math: Ratios 
In this realworld application of ratios, students will learn what a ratio is, including ratios with three terms. They will see different ways of writing ratios, including fractions in simplest form. a:b $\frac{a}{b}$ a to b Two short videos introduce the concept of ratios and each video includes realworld examples of ratios. Then several formative assessments are used to test for understanding. Students then look at the application of ratios to the mixing of concrete at a construction site, starting with a video then followed by an assessment. This lesson can be assigned to individual students or teams of students. The lesson can be completed in about 20 minutes. 

Algebra Application: Why Are Receipts So Long? 
In this Algebra Application, students gather data to study the lengths of paper receipts. They also learn to estimate the total number of receipts produced worldwide using industry data. From this they can study the environmental impact of having to produce so many paper receipts. The math topics covered include:
The culminating activity is for students to make a persuasive case to retailers about finding alternatives to paper receipts, using the data they gathered and analyzed. This is a great backtoschool activity for middle school or high school students. A relevant realworld application allows them to review math concepts. Note: The download is a PDF file that includes the link to the GoogleDoc version. 
Laws of Exponents, Data Analysis  
Algebra Application: Why Are Wildfires So Dangerous? 
In this Algebra Application, students learn about wildfires and the measurement of air quality. The math topics covered include:
The specific focus of this investigation is the health hazards from wildfire smoke. This includes a discussion of air density, measurement in microns, and measurement of air quality. Links to various web sites, including the EPA's site, provide relevant background information and data. The culminating activity is a case study of the wildfires in the Lake Tahoe area. Students analyze historical data and make a recommendation on the air quality. This is a great backtoschool activity for middle school or high school students. A relevant realworld application allows them to review math concepts. Note: The download is a PDF file that includes the link to the GoogleDoc version. 
Laws of Exponents, Applications of Ratios, Proportions, and Percents  
VIDEO: Algebra Applications: Variables and Equations, Segment 3: River Ratios. 
Why do rivers meander instead of traveling in a straight line? In going from point A to point B, why should a river take the circuitous route it does instead of a direct path? Furthermore, what information can the ratio of the river’s length to its straightline distance tell us? In this segment the geological forces that account for a river’s motion are explained. In the process, the socalled Meander Ratio is explored. Students construct a mathematical model of a meandering river using the TINspire. Having built the model, students then use it to generate data to find the average of many Meander Ratios. The results show that on average the Meander Ratio is equal to pi. This video includes a Video Transcript: https://www.media4math.com/library/videotranscriptalgebraapplicationsvariablesandequationssegment3riverratios A Promethean Flipchart is available for this video: https://www.media4math.com/library/prometheanflipchartalgebraapplicationsriverratios 
Applications of Equations and Inequalities, Variables and Unknowns, Variable Expressions  
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. 
Numerical Expressions  
VIDEO: Brief Review: Applications of Rational Numbers 
In this Brief Review, applications of rational numbers are explored. Note: The download is an MP4 file. 
Numerical Expressions  
VIDEO: Brief Review: Dividing Rational Numbers 
In this Brief Review, division of rational numbers is explored. Note: The download is an MP4 file. 
Numerical Expressions  
VIDEO: Brief Review: Multiplying Rational Numbers 
In this Brief Review, multiplying rational numbers is explored. Note: The download is an MP4 file. 
Numerical Expressions  
VIDEO: Brief Review: What Is a Rational Number? 

Numerical Expressions  
Closed Captioned Video: Algebra Applications: Variables and Equations, Segment 3: River Ratios 
Why do rivers meander instead of traveling in a straight line? In going from point A to point B, why should a river take the circuitous route it does instead of a direct path? Furthermore, what information can the ratio of the river’s length to its straightline distance tell us? In this segment the geological forces that account for a river’s motion are explained. In the process, the socalled Meander Ratio is explored. Students construct a mathematical model of a meandering river using the TINspire. Having built the model, students then use it to generate data to find the average of many Meander Ratios. The results show that on average the Meander Ratio is equal to pi. 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 
Applications of Equations and Inequalities, Variables and Unknowns, Variable Expressions  
Closed Captioned Video: Percents: FractionPercent Conversion 
Video Tutorial: Ratios: FractionPercent Conversion. In this video learn how to convert percents to fractions to simplify percent operations. 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 
Percents  
Closed Captioned Video: Rational Numbers: Adding Rational Numbers 
Video Tutorial: Rational Numbers: Adding Rational Numbers. In this video students learn to add 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Comparing and Ordering Rational Numbers 
Video Tutorial: Rational Numbers: Comparing and Ordering Rational Numbers. In this video students learn how to compare and order rational numbers using various techniques. 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Dividing Rational Numbers 
Video Tutorial: Rational Numbers: Dividing Rational Numbers. In this video students learn to divide rational numbers. A Video Transcript is available for this tutorial at this link: Link Note: The download is an MP4 file. Related Resources To see the complete collection of Videos on this topic, click on this link: https://bit.ly/3eZIU07 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Multiplying Rational Numbers 
Video Tutorial: Rational Numbers: Multiplying Rational Numbers. In this video, students learn to multiply 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Numerical Expressions with Rational Numbers 
Video Tutorial: Rational Numbers: Numerical Expressions with Rational Numbers. In this video, students simplify various numerical 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Rational Numbers and Absolute Value 
Video Tutorial: Rational Numbers: Rational Numbers and Absolute Value. In this video, students continue their exploration of rational numbers by investigating absolute value. 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Rational Numbers and Exponents 
Video Tutorial: Rational Numbers: Rational Numbers and Exponents. In this video, students explore the use of rational numbers as exponents with different expressions. A Video Transcript is available for this tutorial at this link: Link Note: The download is an MP4 file. Related Resources To see the complete collection of Videos on this topic, click on this link: https://bit.ly/3eZIU07 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Rational Numbers and Irrational Numbers 
Video Tutorial: Rational Numbers: Rational Numbers and Irrational Numbers. In this video, students learn to distinguish rational numbers from irrational 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 
Rational Expressions  
Closed Captioned Video: Rational Numbers: Rational Numbers on a Number Line 
Video Tutorial: Rational Numbers: Rational Numbers on a Number Line. In this video, students explore rational numbers on a number line. 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 
Rational Expressions  
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 
Rational Expressions  
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 
Rational Expressions  
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 
Rational Expressions  
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 
Rational Expressions  
Closed Captioned Video: Ratios and Proportions: Scale Drawings 
Video Tutorial: Ratios and Proportions: Scale Drawings. In this video, we look at the properties of similar figures and use proportions to find lengths of corresponding sides. 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 
Ratios and Rates 