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Recognize and Represent Proportional Relationships Between Quantities: Ratio, Proportion, Cross Multiply, and Divide

In this Cyberchase media gallery, learn about ratio and proportion and how to use an algebraic shortcut to solve proportion problems. In the accompanying classroom activity, students play a game called the "Pom-Pom Nose Push," in which they collect data and determine the ratio of time to distance. This resource is part of the Math at the Core: Middle School Collection.

Ratio

In this video from Cyberchase, Harry describes ratio as a fixed relationship between two quantities and then provides examples to explain the concept further.

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Proportion

In this video from Cyberchase, Harry builds off the previous explanation of ratio to describe proportion.

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Cross Multiply and Divide

In this video from Cyberchase, learn how to solve proportion problems by using an algebraic shortcut: cross multiply and divide.

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