Title  Description  Thumbnail Image 

Why Are Castles So Tall? 
In this module students explore indirect measurement by seeing how simple angle measure, height measurements, and tangent ratios can be used to calculate distances. The context of castles provides a historically relevant military purpose for the tallness of castles. This module explores Himeji Castle in Japan, as well as other castles. Some of the concepts explored in this module include:
This module provides a nice blend of algebra and geometry topics and can be used in an algebra unit on linear functions, a geometry unit on tangent ratios, or even a precalculus lesson on tangent ratios and functions. 

Algebra Application: Linear Functions: Circumference vs. Diameter 
In this Algebra Application, students study the direction between diameter and circumference of a circle. Through measurement and data gathering students analyze the line of best fit and explore ways of calculating pi. The math topics covered include:
This is a great backtoschool activity for middle school or high school students. This is also a great crossover activity that ties algebra and geometry. Note: The download is a PDF file that includes the link to the GoogleDoc version. 

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. 

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. 

Closed Captioned Video: Percents: Applications of Percent  Grade 
Video Tutorial: Applications of Percent  Grade. In this video we investigate the concept of the grade of a road. This is an application of percents, where the slope of a road or a ski slope is written in percent form. We interpret this percent measurement as a slope measurement. 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: Percents: Calculating Commissions and Tips 
Video Tutorial: Percents: Calculating Commissions and Tips. In this video we look at using percent formulas to calculate sales commissions and tips. Various realworld scenarios are investigated for calculating these percentbased amounts. 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: Percents: Calculating Tax 
Video Tutorial: Percents: Calculating Tax. In this video we look at using tax rates to calculate tax owed. The tax rates are written as percents and converted to decimals to calculate the tax. 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: Percents: Multiple Percents 
Video Tutorial: Percents: Multiple Percents. In this video, we investigate calculating the percent of a percent. Multiple calculations of a percent are investigated relative to a combined percent calculation. 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: Percents: Percent Decrease 
Video Tutorial: Percents: Percent Decrease. In this video, we look at the concept of percent decrease. The formula for calculating percent decrease is shown and used in the context of solving realworld problems. 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: Percents: Percent Increase 
Video Tutorial: Percents: Percent Increase. In this video, we look at the concept of percent increase. The formula for calculating percent increase is shown and used in the context of solving realworld problems. 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: Percents: Percents and Multiples of Numbers 
Video Tutorial: Percents: Percents and Multiples of Numbers. In this video, we explore the difference between percent growth and the multiple of a number. Several realworld examples are used to explore these differences. 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: Percents: Probabilities and Percents 
Video Tutorial: Percents: Probabilities and Percents. In this video, percent calculations are used to explore probabilities of events. From a percentbased probability predictions are made for given outcomes. 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: Percents: Simple Interest 
Video Tutorial: Percents: Simple Interest. In this video, we look at simple interest in the context of using percent to make calculations. A formula for calculating simple interest is shown and used to solve several realworld problems. 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: Ratios: Application of Ratios: Roofs and Ramps 
In this video, we explore the application of ratio concepts to the pitch of a roof and the slope of a ramp. Several realworld examples are explored. 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 

DefinitionRatios, Proportions, and Percents ConceptsCalculating Tax 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsCalculating Tips 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsConverting Units 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsDimensional Analysis 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsEquivalent Ratios 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsParttoPart Ratios 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsParttoWhole Ratios 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsPercent 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsPercent Decrease 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsPercent Increase 
This is a collection of definitions related to ratios, proportions, and percents. This includes general definitions for ratios, proportions, percents, as well as terms related to similarity, proportionality, and equivalence of ratios. Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 

DefinitionRatios, Proportions, and Percents ConceptsPercent of a Number 
Note: The download is a PNG file. Related ResourcesTo see the complete collection of Math Definitions on this topic, click on this Link. 