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View Resource To Fret or Not to Fret

This math unit from Illuminations allows students to examine geometric sequences and exponential functions through the example of the placement of frets on stringed instruments. The unit includes two lessons, appropriate for grades 9-12. In the first lesson, students will measure the distance from the bridge to the nut and each fret on a stringed instrument. In the second lesson, the students...

View Resource Dividing a Town into Pizza Delivery Regions

This lesson from Illuminations asks students to construct perpendicular bisectors, find circumcenters, calculate area, and use proportions to solve a real-world problem. Concepts taught in the lesson include perpendicular bisectors, the circumcenter of a circle, the Voroni diagram, and using ratios and proportions to solve problems. The lesson is intended for grades 9-12 and should require 2...

View Resource Ratios and Proportions

In this learning object from Wisc-Online, students will examine ratios and proportions. The unit's activities include defining ratios and proportions, simplifying ratios, solving problems using proportions and answering practice questions.

View Resource PhET: Estimation Game

This simulation provides practice on estimation of relative sizes. The user must estimate the relative lengths, areas, or volumes of objects. This activity builds student abilities to understand ratios and the scaling of sizes in different dimensions. It also includes a strategy section that teaches students how to visualize relative areas and volumes.

View Resource Point Estimation: Odds Ratios, Hazard Ratios, Risk Differences, Precision

This site provides a PowerPoint presentation, created by Dr. Elizabeth Garrett-Mayer of Johns Hopkins University, of a lesson and examples of point estimation, odds ratios, hazard ratios, risk differences and precision. The presentations is quite thorough. The author attempts to define, provide examples of, and then show the application of almost every concept. The presentation follows a easily...

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