Quia
Ixl Learning: Proportions
Brush up on your math skills relating to proportions then try some practice problems to test your understanding.
Quia
Ixl Learning: Constant of Proportionality
Brush up on your math skills relating to the constant of proportionality then try some practice problems to test your understanding.
PBS
Pbs Learning Media: Math + Arts: Dragon Scales
In this lesson plan, students create a class mural by using scale, ratio, and proportion. Media resources and teacher materials are included.
Purple Math
Purplemath: Ratios
Explains the basic terminology and formatting of ratios, and demonstrates how to solve typical exercises.
Other
Nearpod: Proportional Relationships
In this lesson, 7th graders will learn how to identify proportional relationships from tables, graphs, and equations. They will also learn how to identify the unit rate and write an equation to represent proportional relationships.
Arcademics
Arcademics: Dirt Bike Proportions
This online multi-player race game allows students to practice solving proportions by finding the missing piece. The players they play against are within the computer, not necessarily their own classroom.
The Math League
The Math League: Ratio and Proportion
Detailed explanations of ratio, comparing ratios, proportion, rate, converting rates, and average rate of speed, all with examples.
The Math League
The Math League: Ratio
This site gives a definition of a ratio along with two word problems. Also shows the student how to compare ratios using fractions.
TED Talks
Ted: Ted Ed: The Moon Illusion
Andrew Vanden Heuvel unravels the details of focus, distance, and proportion that contribute to the mystifying optical illusion. [4:09]
Other
All Elementary Mathematics: Proportionality and Ratio
A brief explanation of the mathematical relationship between ratio, proportion, and proportionality. Examples are included.
Sophia Learning
Sophia: Equivalent Ratios: Lesson 5
This lesson will introduce the means and extremes of a proportion, and demonstrate how to use cross multiplication to determine if two ratios are equivalent. It is 5 of 8 in the series titled "Equivalent Ratios."
Sophia Learning
Sophia: Equivalent Ratios: Lesson 8
This lesson will introduce the means and extremes of a proportion, and demonstrate how to use cross multiplication to determine if two ratios are equivalent. It is 8 of 8 in the series titled "Equivalent Ratios."
Sophia Learning
Sophia: Sas Triangle Similarity: Lesson 3
This lesson will provide examples that demonstrate how two triangles would be similar by SAS triangle similarity. It is 3 of 5 in the series titled "SAS Triangle Similarity."
Sophia Learning
Sophia: Using Equations to Describe Proportions
This lesson explains how proportional relationships can be described using equations.
ClassFlow
Class Flow: Proportions
[Free Registration/Login Required] This lesson contains notes and examples for instructing how to solve proportions. Begins with relations to equivalent fractions, and then gets into solving algebraically using cross products. It...
ClassFlow
Class Flow: Proportions and Similarity
[Free Registration/Login Required] Flipchart walks through the lesson on Proportions and similarity, as well as some of the theorems that support the concept.
ClassFlow
Class Flow: Ratio
[Free Registration/Login Required] In this flipchart, students apply their understanding of ratio, percent, and direct proportion in various situations. Students solve problems involving ratio and proportion with similar figures and with...
ClassFlow
Class Flow: Sales Tax
[Free Registration/Login Required] In this flipchart, students apply ratio, percent, and direct proportion in situations. Students solve problems involving percentages such as percent increase/decrease, tax, commission, and discount.
ClassFlow
Class Flow: Similar Shapes
[Free Registration/Login Required] In this flipchart, students use the drawing and interactive tools in Activstudio to apply geometric properties and relationships to describe, compare, and draw two-dimensional shapes and figures.
ClassFlow
Class Flow: Solving Proportions
[Free Registration/Login Required] This lesson introduces the cross product method for solving proportions. It also connects the mathematical content to real-world applications.
Smithsonian Institution
Smithsonian American Art Museum: Benjamin Trott
As part of the Smithsonian Art Museum's database of artists, Benjamin Trott is described here along with information on his contributions to art through his work in creating miniatures.
Free Math Help
Free Math Help: Direct Variation
The discussion examines direct variation. Students learn about the math concept through definitions and sample exercises.
Wyzant
Wyzant: Proportions Basics Worksheet
An interactive quiz from WyzAnt of 20 proportions are presented for the students to solve and then check their answers. All can be computed with simple cross-multiplying.
ClassFlow
Class Flow: Introduction to Ratio and Proportions
[Free Registration/Login Required] This flipchart introduces the concept of ratios and proportions using a variety of visuals and manipulatives.