Scholastic
Scholastic: Study Jams! Math: Algebra: Ratio
Explore word problems about ratios and watch and listen to all the steps needed to solve.
Math Is Fun
Math Is Fun: Golden Ratio
A clear explanation, with drawings and examples, of the golden ratio. The examples demonstrate the beauty of mathematics, such as how two Fibonacci numbers can approximate the golden ratio, and why the golden ratio can be called the...
University of Cambridge
University of Cambridge: Maths and Sports: Triathlon and Fitness
The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories? This activity provides a real-life context for working with proportionality, speed, rates, and units of measurement and is aimed...
Khan Academy
Khan Academy: Ratio Tables
Practice filling out tables of equivalent ratios. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Texas Instruments
Texas Instruments: Math Today Wing Tabs Save Fuel
Using the USA TODAY Infograph, 'Wing tabs save fuel', ratios and proportions will be used to explore the concept of similarity between a drawing/model and the actual dimensions. The effects of dilation (size change) on an image and...
PBS
Pbs Teachers: Math Space Odyssey: How Much Do You Weigh in Outer Space?
Demonstrate the ability to apply the use of decimals, fractions, ratios and proportions to situations based upon given information about planets in the solar system.
OER Commons
Oer Commons: Introduction to Ratio Tables
Seventh graders use ratio cards to find equivalencies and form partnerships for the week. As a class, 7th graders discuss and decide on classroom norms. Give each student a ratio card. Instruct students to find a classmate whose card has...
Discovery Education
Discovery Education: Web Math: Proportions
This WebMath site provides a general description of proportions. Content also includes a 'problem solver' which lists step-by-step instructions on how to obtain the correct answer.
Mangahigh
Mangahigh: Number: Working With Ratios
Deterime the ratios of amounts to one another and then simplify.
Mangahigh
Mangahigh: Number: Ratios
Test your knowledge of ratios by determining the equivalents and how to interpret the given ratio.
University of South Florida
Fcat: Using Proportions and Go Fish!
Students "go fishing" and use proportions to learn how estimating is used to determine the size of a population.
Wolfram Research
Wolfram Math World: Golden Ratio
Math World explains the Golden Ratio, gives the formula for finding the irrational number, and expresses this value as an infinite series. Also defines and represents the Ratio geometrically, its relationship to the Fibonacci numbers,...
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.
Lawrence Hall of Science
The Math Page: Skill in Arithmetic: Proportionality
Acquire a deeper understanding of the concept of proportionality. Concise definitions, detailed examples, and an interactive worksheet to apply what you have learned.
Math.com
Math.com: Similar Figures
This example provides a clear explanation of how to compare figures to see if they are similar and the formula to determine if the ratios are equal. Interactive practice activities are provided.
McGraw Hill
Glencoe: Self Check Chapter Test Exploring Ratio, Proportions, and Percent
The interactive assessment examines ratios, proportions, and percents. Students complete 14 questions created by Glencoe. Hints and solutions are included.
McGraw Hill
Glencoe: Self Check Chapter Test Ratio, Proportion, and Percent
Use Glencoe's randomly generated self-checking chapter test to assess your knowledge on ratios, proportions, and percents. Each question has a "Hint" link to help. After completing the test students can click the "Check It" button and...
Khan Academy
Khan Academy: Identify Proportional Relationships
Practice telling whether or not the relationship between two quantities is proportional by analyzing word problems. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
McGraw Hill
Glencoe Mathematics: Online Study Tools: Ratio, Proportion, and Percent
Students show comprehension of basic arithmetic skills. The online test assesses scholars on ratios, proportions, and percents.
Rice University
Rice University: Cynthia Lanius: All About Ratios
Make Texas chili as you learn about ratios in this interactive lesson. Students get immediate feedback on their responses and teachers have access to online assessment.
PBS
Pbs: The Lowdown: Percents Combined: Proportional Relationships With Multistep Ratio and Percent Problems
Learn how to calculate sale price when combining two "percent-off" discounts in this video from KQED. In the accompanying classroom activity, students develop and share a variety of strategies, including modeling with a 10 x 10 grid to...
PBS
Pbs: Human Tree: Ratios
Watch as the National Museum of Mathematics creates an interesting series of images using ratios. This video focuses on the proportional relationship observed in fractals and challenges you to do some critical thinking using ratios and...
Khan Academy
Khan Academy: Constant of Proportionality From Tables (With Equations)
Practice finding the constant of proportionality from tables with equations.
Khan Academy
Khan Academy: Constant of Proportionality From Equations
Practice finding the constant of proportionality in equations.