Seventh graders find the unit rate of a ratio situation.

Under certain conditions, the risk of developing coronary heart disease (strokes, heart attack) cannot be properly assessed only by looking at a person's lipids test results. In these cases, the LDL "bad cholesterol" to HDL "good...

How can you use a bar model to represent ratio problems? Students work with problem sets on the Thinking Blocks website.

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

Looks at how spirals form in nature when cells reproduce in a flower, for example. An interactive lets students try entering different values to see if they can make a spiral pattern with no gaps. The correct figure would be the Golden...

Learners explore the concepts of rate and ratio in a variety of problem-solving situations. Worksheets contain definitions and visual representations of concepts. Link to related ratio game. Other skills include measurement, data...

The learning activity consists of word problems that investigate ratios. Detailed explanations are included.

[Free Registration/Login may be required to access all resource tools.] This study guide reviews ratios, proportions, and cross-multiplication.

Explains what rates and ratios are and how they are different. Shows how to solve an example problem about ratios and presents a video demonstrating how to show a ratio as a fraction or a decimal. [1:52]

This site gives a definition of a ratio along with two word problems. Also shows the student how to compare ratios using fractions.

Investigate how ratios can be used to compare objects of the same type on this site. The site includes some explanation and examples.

This tutorial provides definitions and examples of ratios and proportions and features comparing ratios and converting rates.

Understand the right triangle definition of sec, csc, and cot ratios.

Detailed explanations of ratio, comparing ratios, proportion, rate, converting rates, and average rate of speed, all with examples.

Website which strengthens the conceptual connection between scale drawings and ratios through an activity lesson.

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.

Sixth graders will be using ratio tables to convert units of metric measurements and looking for patterns to help make the problems easier.

In this advanced simulation, students experiment with changing the ion ratios in solutions and thus the pH. The experiment can be viewed on a macroscopic or microscopic level, or customized.

Proportions where students determine the missing number to make the proportion true.

An interactive simulation that teaches about ratios, proportional reasoning, and using double number lines to look for patterns through interactions while shopping for fruits, vegetables, and candy and by comparing cars with different...

The mathematics resource consists of an assessment with hints and solutions. Students answer questions that review proportional reasoning.

Define the trigonometric ratios in terms of ratios of the sides of a right triangle.

Students learn how to solve proportions. The mathematics resource consists of examples and practice problems with answers.

This lesson plan explores how Chuck Close uses photography and a mathematical grid to create his large portraits. Hands-on activities encourage students to create using the grid, during which they will learn about variation, repetition,...