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.
ClassFlow
Class Flow: Math Ratio
[Free Registration/Login Required] The teacher will use this lesson plan flipchart to review simple problems.
Other
All Elementary Mathematics: Proportionality and Ratio
A brief explanation of the mathematical relationship between ratio, proportion, and proportionality. Examples are included.
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.
The Math League
The Math League: Ratio and Proportion
This tutorial provides definitions and examples of ratios and proportions and features comparing ratios and converting rates.
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.
Other
Nm Learning Games Lab: Math Snacks
Games and videos, each accompanied by guidelines for teachers and students, cover math topics such as proportion, ratio, number line, scale, and measurement. Downloads are available for iPad, iPhone, and iPod Touch.
PBS
Pbs: Real World Proportional Relationships: Gender Wage Gap
Using this infographic, learn how wage equity today compares with data from 50 years ago, at the dawn of the equal pay movement. The accompanying classroom activity invites students to explore the change in the gender wage gap from 1965...
Alabama Learning Exchange
Alex: Thirsty for Ratios
In this lesson, the students will learn what a ratio is and how it can be used in a comparison. In this lesson, students will also determine how to combine a sports drink in powder form and water to make enough for a whole football team....
Cool Math
Coolmath: Coolmath4kids: Dirt Bike Proportions
Find the number which makes the fractions equal in this multiplayer race!
Lawrence Hall of Science
The Math Page: Trigonometry
Concepts in Trigonometry are explained and illustrated here by a member of the math department at Borough of Manhattan Community College.
E-learning for Kids
E Learning for Kids: Math: Dance Performance: Position on a Map
This interactive website allows students to practice their map skills including scale factors on a map.
Math Slice
Math Slice: Ratios and Proportions: Math Worksheets
This tool allows you to create worksheets of word problems involving ratio and proportion.
National Council of Teachers of Mathematics
The Math Forum: Ratios and Fractions
A seventh-grade student is having trouble understanding ratios, fractions, and simplest form. Dr. Math to the rescue! Real-world, easy to grasp examples.
National Council of Teachers of Mathematics
The Math Forum: Means Proportional and Geometric Means
Dr. Math helps a student discover the meaning of the mean proportional of two numbers. Detailed explanation with examples.
Other
Mathpower: Math Fundamental Assignments
Math variety of concepts, this colorful website is sure to give your students the chance show what they know. Concepts covered include rounding, division with decimals, order of operations, ratio, percent, multiplication, and division of...
Free Math Help
Free Math Help: Direct Variation
The discussion examines direct variation. Students learn about the math concept through definitions and sample exercises.
Other
The Futures Channel: Proportional Reasoning
"Connecting learning to the real world" is the goal of the Futures Channel. Through the use of short videos, teachers can integrate real-world examples of how math and science are used in everyday life. Complete teaching guidelines...
Shmoop University
Shmoop: Ratios & Percentages: Solving Proportions
Students learn how to solve proportions. The mathematics resource consists of examples and practice problems with answers.
Math Planet
Math Planet: Algebra 1: Calculating With Percents
Provides examples and a video lesson that illustrates how to solve percent problems.
Shmoop University
Shmoop: Ratios & Percentages: Ratios & Proportions
Students learn about ratios and percentages in the tutorial. The mathematics resource consists of examples and practice problems with answers.
CK-12 Foundation
Ck 12: Measurement: Scale Distances or Dimensions
[Free Registration/Login may be required to access all resource tools.] Recognize unit scale as a ratio between units of measure of scale dimension to actual dimension.
PBS
Pbs Learning Media: Cyberchase: Bianca Gets in Gear
Bianca visits a bike shop and learns how bicycle gears work in this Cyberchase video segment. [3:26]