# ## On this page you'll find a sampling of the many resources on Media4Math that focus on the topic of Ratios, Proportions, and Percents. Media4Math is a digital library of over 15,000 resources on all key topics in K-12 math.

Number of Resources: 757
Thumbnail Image Description In this Algebra Application, students study the life cycles of 13- and 17-year cicadas, as well as the populations of bird predators. Students develop a mathematical model using spreadsheets and investigate why the prime number life cycles help the cicadas. The math topics covered include:

## 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:

Mathematical modeling
Linear functions
Data gathering and analysis
Ratios
Direct variation

## 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:

Scientific notation
Rates
Density
Data Analysis

## Algebra Applications: Dinosaur Footprints Paleontologists rely on fossils to learn about dinosaurs. They also rely on certain algebraic concepts to help them estimate the sizes of dinosaurs based on the measurements of dinosaur footprints. In this activity, walk students through the solution of several proportions to estimate the sizes of different dinosaurs.

## Closed Captioned Video: Percents: Applications of Percent -- Grade # Description

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.

## Closed Captioned Video: Percents: Calculating Commissions and Tips # Description

Video Tutorial: Percents: Calculating Commissions and Tips. In this video we look at using percent formulas to calculate sales commissions and tips. Various real-world scenarios are investigated for calculating these percent-based amounts.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Calculating Tax # Description

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.

## Closed Captioned Video: Percents: Calculating the Whole Given a Percent # Description

Video Tutorial: Percents: Calculating the Whole Given a Percent. In this video learn how to calculate the whole, given a percent and a part of the whole. Students solve percent equations.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Estimating Percents # Description

Video Tutorial: Estimating Percents. In this video learn how to estimate percents by converting them to fractions that simplify multiplication.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Fraction-Percent Conversion # Description

Video Tutorial: Ratios: Fraction-Percent Conversion. In this video learn how to convert percents to fractions to simplify percent operations.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Multiple Percents # Description

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.

## Closed Captioned Video: Percents: Percent Decrease # Description

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 real-world problems.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Percent Increase # Description

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 real-world problems.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Percent of a Difference # Description

Video Tutorial: Percents: Percent of a Difference. In this video, students learn how to calculate the whole, given the percent and a part corresponding to another percent. The solution involves a percent difference.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Percent of a Number # Description

Video Tutorial: Percents: Percent of a Number. In this video, learn how to find the percent of a number. The examples focus on converting a percent to a decimal.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Percents and Multiples of Numbers # Description

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 real-world examples are used to explore these differences.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Probabilities and Percents # Description

Video Tutorial: Percents: Probabilities and Percents. In this video, percent calculations are used to explore probabilities of events. From a percent-based probability predictions are made for given outcomes.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Simple Interest # Description

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 real-world problems.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: The Percent One Number is of Another # Description

Video Tutorial: Percents: The Percent One Number is of Another. In this video, students learn how to calculate what percent one number is of another. This includes percents greater than 100%.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Percents: Visual Models for Percents # Description

Video Tutorial: Percents: Visual Models for Percents. In this video, learn how to model percent operations using visual models.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Ratios and Proportions: Scale Drawings # Description

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.

## Closed Captioned Video: Ratios and Proportions: Solving Proportions # Description

Video Tutorial: Ratios and Proportions: Solving Proportions. In this video, we solve proportion problems algebraically.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Ratios and Proportions: What Are Proportions? # Description

Video Tutorial: Ratios and Proportions: What are Proportions?. In this video, we solve proportion problems using equivalent ratios.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Ratios and Rates: Converting Measurement Units # Description

Video Tutorial: Ratios and Rates: Converting Measurement Units. In this video, we show how to use conversion rates to convert from one unit of measurement to another. Students are shown how to create a conversion rate.
A Video Transcript is available for this tutorial.

## Closed Captioned Video: Ratios and Rates: Rates and Slopes of Lines # Description

Video Tutorial: Ratios and Rates: Rates and Slopes of Lines. In this video we connect the concept of rate of change for a set of linear data to the concept of slope. We use the slope formula to find the rate of change.
A Video Transcript is available for this tutorial.