Standard #: MAFS.7.RP.1.2 (Archived Standard)

Students are asked to identify and explain the constant of proportionality in three different equations.

Students are asked to graph four ordered pairs given in context and decide if the variables they represent are proportionally related.

Students are asked to identify and explain the constant of proportionality given a verbal description and a diagram representing a proportional relationship.

Students are asked to write an equation to represent a proportional relationship depicted in a graph.

Students are asked to identify the graph of a proportional relationship.

Students are given a graph that models the hourly earnings of a babysitter and are asked to interpret ordered pairs in context.

Students are asked to determine the constant of proportionality using a table and a graph.

Students decide if two variables are proportionally related based on data given in a table.

Students are given the number of calories in a serving of oatmeal and are asked to write an equation that models the relationship between the size of the serving and the number of calories.

Students will create a proportional self portrait from a photo using a gridded drawing method and learn how a grid system can help accurately enlarge an image in a work of art. Students will use the mathematical concepts of scale, proportion and ratio, to complete their artwork.

Read about a recent uncovering of mammoths to engage students in a discussion of radioactive dating. This is the first lesson in a unit of 4 lessons that integrates science, math, and computer science standards to teach the concept of half-lives and radioactive dating.

This STEM lesson, complete with a design challenge, helps students design, build, and test irrigation methods. Students will incorporate and develop math skills through solving proportions as they work in teams to solve an engineering challenge.

Students investigate how the pedal and rear wheel gears affect the speed of a bicycle. A GeoGebra sketch is included that allows a simulation of the turning of the pedal and the rear wheel. A key goal is to provide an experience for the students to apply and integrate the key concepts in seventh-grade mathematics in a familiar context.

Using a guided-inquiry model, students in a math or science class will use an experiment testing the effect of temperature on cricket chirping frequency to teach the concepts of representative vs random sampling, identifying directly proportional relationships, and highlight the differences between scientific theory and scientific law.

Students will measure the length of different sized leaves and corresponding veins to determine proportionality.  Students will graph their results on a coordinate grid and write about their results. 

This lesson addresses part a. of the Standard. It introduces proportions and addresses solving proportion problems with ratio tables. Students will be able to identify whether a statement shows proportionality or is simply two non-proportional ratios. The focus will be on recognizing visual proportions as being equivalent values and will lead into recognizing ratios represented as fractions as equivalent or non-equivalent.

This lesson unit is intended to help you assess whether students recognize relationships of direct proportion and how well they solve problems that involve proportional reasoning. In particular, it is intended to help you identify those students who use inappropriate additive strategies in scaling problems, which have a multiplicative structure, rely on piecemeal and inefficient strategies such as doubling, halving, and decomposition, and have not developed a single multiplier strategy for solving proportionality problems and see multiplication as making numbers bigger, and division as making numbers smaller.

This lesson introduces the geologic time scale and the concept of time segments being divided by major events in Earth's history. It gives students an opportunity to place various fossils into appropriate periods, observe the change in the complexity of fossils and draw conclusions regarding the change. Students complete a brace map including the eras and periods showing their understanding of parts to the whole within the geologic time scale. On day 2, students research an organism of their choice and trace it back to their most basic relative. Students then create a final product, such as a brochure, timeline or a poster, demonstrating the change of the organism over time. Students will be provided with a rubric that will guide them while they work on the final product.

• Translating between percents, decimals, and fractions.
• Representing percent increase and decrease as multiplication.
• Recognizing the relationship between increases and decreases.

Students will act as mathematicians and scientists as they use models, observations and space science concepts to perform calculations and draw inferences regarding a fictional solar system with three planets in circular orbits around a sun. Among the calculations are estimates of the size of the home planet (using a method more than 2000 years old) and the relative distances of the planets from their sun.

Students will learn that a direct variation is a proportional relationship that can be represented by a table, a graph, or an equation. They will also be able to recognize if they are dealing with a direct variation by the table, graph, or equation.

This is the first part of the Unit Lesson, "Makeover Home Edition". This lesson is designed to get the students excited about the unit. Students will have to think critically about fencing in their new "dream" backyard by calculating total fencing needed and choosing the most cost effective method of purchasing their fencing by comparing unit rates mathematically and graphically. Part II (#48967) will concentrate on inserting a pool and patio into this backyard. Part III (#49025) will deal with creating a scale drawing of this backyard. Part IV (#49090) focuses on inserting a window and painting walls inside the house.

The purpose of this lesson is to introduce rates of change to students, allowing them to explore how rates are formed, what rates are used for, and how rates can be used to solve real life problems.

Students will explore how percentages, proportions, and solving for unknowns are used in important jobs. This interactive activity will open their minds and address the question, "When is this ever used in real life?"

Nestle Waters discusses the importance of unit rate in the manufacturing process of bottling spring water.

Download the CPALMS Perspectives video student note taking guide.

Master candymaker Wes Raley describes the process and science behind making sour fizzy candy. 

Download the CPALMS Perspectives video student note taking guide.

An archaeologist describes how mathematics can help prove a theory about mysterious prehistoric structures called shell rings.

Math - the secret ingredient for an excellent cup of coffee!

Download the CPALMS Perspectives video student note taking guide.

Students must use the information to answer the multiple tasks provided.

Students are asked to use ratios and proportional reasoning to compare paint mixtures numerically and graphically.

Giving the amount of paint in "parts" instead of a specific standardized unit like cups might be confusing to students who do not understand what this means. Because this is standard language in ratio problems, students need to be exposed to it, but teachers might need to explain the meaning if their students are encountering it for the first time.

Use the information provided to answer the questions regarding Carlos and his bananas

This is a task where it would be appropriate for students to use technology such as a graphing calculator or GeoGebra, making it a good candidate for students to engage in Standard for Mathematical Practice 5 Use appropriate tools strategically. A variant of this problem is appropriate for 8th grade; see Coffee by the Pound.

This problem requires a comparison of rates where one is given in terms of unit rates, and the other is not. See "Music Companies, Variation 2" for a task with a very similar setup but is much more involved and so illustrates .

Students should use information provided to answer the questions regarding robot races.

Students are asked to decide if two given ratios are equivalent.

This video shows how to recognize and understand graphs of proportional relationships to find the constant of proportionality.

Here's an introductory video explaining the basic reasoning behind solving proportions and shows three different methods for solving proportions which you will use later on to solve more difficult problems. 

This video provides assistance with understanding direct and inverse variation.

This site explicitly outlines the steps for using the proportion method to solve three different kinds of percent problems. It also includes sample problems for practice determining the part, the whole or the percent.

This manipulative will help you to explore the world of lines. You can investigate the relationships between linear equations, slope, and graphs of lines.

Allows students access to a Cartesian Coordinate System where linear equations can be graphed and details of the line and the slope can be observed.

With a mouse, students will drag data points (with their error bars) and watch the best-fit polynomial curve form instantly. Students can choose the type of fit: linear, quadratic, cubic, or quartic. Best fit or adjustable fit can be displayed.

An archaeologist describes how mathematics can help prove a theory about mysterious prehistoric structures called shell rings.

Students are asked to use ratios and proportional reasoning to compare paint mixtures numerically and graphically.

This problem requires a comparison of rates where one is given in terms of unit rates, and the other is not. See "Music Companies, Variation 2" for a task with a very similar setup but is much more involved and so illustrates .

Students should use information provided to answer the questions regarding robot races.

Students are asked to decide if two given ratios are equivalent.

This video shows how to recognize and understand graphs of proportional relationships to find the constant of proportionality.

Here's an introductory video explaining the basic reasoning behind solving proportions and shows three different methods for solving proportions which you will use later on to solve more difficult problems. 

This video provides assistance with understanding direct and inverse variation.

This site explicitly outlines the steps for using the proportion method to solve three different kinds of percent problems. It also includes sample problems for practice determining the part, the whole or the percent.

Allows students access to a Cartesian Coordinate System where linear equations can be graphed and details of the line and the slope can be observed.

With a mouse, students will drag data points (with their error bars) and watch the best-fit polynomial curve form instantly. Students can choose the type of fit: linear, quadratic, cubic, or quartic. Best fit or adjustable fit can be displayed.

An archaeologist describes how mathematics can help prove a theory about mysterious prehistoric structures called shell rings.

Students must use the information to answer the multiple tasks provided.

Students are asked to use ratios and proportional reasoning to compare paint mixtures numerically and graphically.

Giving the amount of paint in "parts" instead of a specific standardized unit like cups might be confusing to students who do not understand what this means. Because this is standard language in ratio problems, students need to be exposed to it, but teachers might need to explain the meaning if their students are encountering it for the first time.

Use the information provided to answer the questions regarding Carlos and his bananas

This is a task where it would be appropriate for students to use technology such as a graphing calculator or GeoGebra, making it a good candidate for students to engage in Standard for Mathematical Practice 5 Use appropriate tools strategically. A variant of this problem is appropriate for 8th grade; see Coffee by the Pound.

This problem requires a comparison of rates where one is given in terms of unit rates, and the other is not. See "Music Companies, Variation 2" for a task with a very similar setup but is much more involved and so illustrates .

Students should use information provided to answer the questions regarding robot races.

Students are asked to decide if two given ratios are equivalent.

Allows students access to a Cartesian Coordinate System where linear equations can be graphed and details of the line and the slope can be observed.