CK-12 Foundation
Ck 12: Chemistry: Mass Ratio Calculation
[Free Registration/Login may be required to access all resource tools.] Explains mass ratio definition and mass ratio calculations.
University of Minnesota
U Mn: Gender Ratios in Global Migration: Men Who Migrate, Women Who Wait?
This resource uses a text and graph to show how the gender ratio of international migrants - the proportion of male to female migrants - has changed over time. Its goal is to stimulate thinking about shifting gender ratios in global...
Better Lesson
Better Lesson: Understanding Tape Diagrams
Using a tape diagram is one of the key models for ratios and proportions.
Illustrative Mathematics
Illustrative Mathematics: 7.rp Two School Dance
The purpose of this task is to see how well students students understand and reason with ratios. This task was adapted from problem #14 on the 2011 American Mathematics Competition (AMC) 8 Test. Aligns with 7.RP.A.3. The site provides a...
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...
Illustrative Mathematics
Illustrative Mathematics: 6.rp Jim and Jesse's Money
In this real-world context, 6th graders are given the ratio of Jim's money to Jesse's and the amounts they have spent so far on a road trip, and they must calculate what each person had at the start of the trip. Aligns with 6.RP.A.3.
Common Core Sheets
Common Core Sheets: Rate Language 6.rp.2 Worksheets
Print or create worksheets or flashcards to assess students' understanding of ratio concepts.
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.
Wyzant
Wyzant: Proportion Basics
WyzAnt provides an explanation and examples on solving proportions. Proportions practice problems and a proportion calculator are included in this lesson.
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...
Texas Instruments
Texas Instruments: What's My Ratio?
In this activity, students use linear measurement and calculators to investigate proportionality and determine the constant ratio between similar figures.
National Council of Teachers of Mathematics
The Math Forum: Ask Dr. Math: Cake Recipe Ratio
Dr. Math has to go into the kitchen to solve this real-world problem. A student is looking for a solution to a ratio problem about baking a cake. You'll need to stir up your knowledge of ratios, fractions, decimals, proportions, and...
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...
AAA Math
Aaa Math: Ratios
This short exercise gives the student a ratio in reduced terms, and then gives the students a replacement value for one part of the ratio. The student is then to input the other part of the replacement ratio so as to keep the two ratios...
Cool Math
Coolmath: Coolmath4kids: Dirt Bike Proportions
Find the number which makes the fractions equal in this multiplayer race!
Mangahigh
Mangahigh: Number: Recognize Proportions
Test your knowledge of proportions and how they relate to parts of a whole.
Texas Instruments
Texas Instruments: Similar Triangles and Proportions
In this activity, students will investigate the relationship among the similar triangles formed when a segment is constructed parallel to one side of a triangle. They will explore the various ratios that exist between the lengths of the...
University of South Florida
Fcat: The Shadow Knows (Ratio, Proportion & Measurement)
Students use their height and the length of the shadow to determine the height of buildings. A great outdoor activity to learn about proportions and ratios.
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.
Purple Math
Purplemath: Proportions: Introduction
Explains the basics and terminology of proportions.
Ducksters
Ducksters: Kids Math: Ratios, Fractions, and Percentages
This page explores how ratios can be written as fractions. The site also discusses proportions and reducing ratios with problems and examples.
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.
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.
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