[Free Registration/Login may be required to access all resource tools.] In this lesson students write and solve proportions. Students examine guided notes, review guided practice, watch instructional videos and attempt practice problems.

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...

[Free Registration/Login may be required to access all resource tools.] This concept teaches students what a ratio is and how to use one. Students examine guided notes, review guided practice, watch instructional videos and attempt...

[Free Registration/Login may be required to access all resource tools.] Learn how to use ratios and proportions to solve problems.

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...

You can pick up some valuable ratio pointers here. When you finish working your way through the three instructional pages, go on to the Activity for some practice, or take an online "Test Bite" and check your understanding.

In this video, Harry finds money on the sidewalk. He uses ratio, proportion, and some knowledge about shadows to return it to the rightful owner. In the accompanying classroom activity, students investigate whether there is a consistent...

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...

[Free Registration/Login may be required to access all resource tools.] In this lesson students simplify ratios by dividing by the greatest common factor. Students examine guided notes, review guided practice, watch instructional videos...

Identify ratios in this learning game with martians.

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.

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...

Practice solving ratio word problems like, "If Ben reads 10 pages in 15 minutes, how long does it take him to read 40 pages?" Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or...

This site contains a lesson about ratios and unit rates as well as guided and independent practice for students to review the skills.

Explore word problems about ratios and watch and listen to all the steps needed to solve.

In these KQED Lowdown infographics, explore how adult obesity rates in the United States, as measured by body mass index (BMI), have dramatically changed in the past half-century. A circular graph and a pictograph depict data by decade,...

Discover how percents and proportions help explain issues like climate change, composting, and zero waste in this video from KQED. In the accompanying classroom activity, students estimate the percentage of various types of trash that...

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...

The ratio calculator performs three types of operations and shows the steps to solve. It simplifies ratios or creates an equivalent ratio when one side of the ratio is empty, solves ratios for the one missing value when comparing ratios...

Print or create worksheets or flashcards to assess students' understanding of how to use proportional relationships to solve multistep ratio and percent problems.

Print or create worksheets or flashcards to assess students' understanding of ratio concepts, useage of ratio reasoning, and percentages.

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...

Test your knowledge using proportions.

[Free Registration/Login Required] Students explore scale and indirect measurement by navigating through the interactive learning module and then answering questions that go along with the module. Students can also learn more about the...