Reflecting on Teaching & Learning About Ratios
Common Core State Standards
Math 
Math 
6 
Grade 6 
RP 
Ratios & Proportional Relationships 
A 
Understand ratio concepts and use ratio reasoning to solve problems 
2 
Understand the concept of a unit rate a/b associated with a ratio a:b with b not equal to 0, and use rate language in the context of a ratio relationship. For example, "This recipe has a ratio of 3 cups of flour to 4 cups of sugar, so there is 3/4 cup of flour for each cup of sugar." "We paid $75 for 15 hamburgers, which is a rate of $5 per hamburger." Expectations for unit rates in this grade are limited to noncomplex fractions. 
Download Common Core State Standards (PDF 1.2 MB) 
Common Core State Standards
Math 
Math 
6 
Grade 6 
RP 
Ratios & Proportional Relationships 
A 
Understand ratio concepts and use ratio reasoning to solve problems 
3 
Use ratio and rate reasoning to solve realworld and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations. a. Make tables of equivalent ratios relating quantities with wholenumber measurements, find missing values in the tables, and plot the pairs of values on the coordinate plane. Use tables to compare ratios. b. Solve unit rate problems including those involving unit pricing and constant speed. For example, if it took 7 hours to mow 4 lawns, then at that rate, how many lawns could be mowed in 35 hours? At what rate were lawns being mowed? c. Find a percent of a quantity as a rate per 100 (e.g., 30% of a quantity means 30/100 times the quantity); solve problems involving finding the whole, given a part and the percent. d. Use ratio reasoning to convert measurement units; manipulate and transform units appropriately when multiplying or dividing quantities. 
Download Common Core State Standards (PDF 1.2 MB) 
Common Core State Standards
Math 
Math 
7 
Grade 7 
RP 
Ratios & Proportional Relationships 
A 
Analyze proportional relationships and use them to solve realworld and mathematical problems 
2 
Recognize and represent proportional relationships between quantities. a. Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin. b. Identify the constant of proportionality (unit rate) in tables, graphs, equations, diagrams, and verbal descriptions of proportional relationships. c. Represent proportional relationships by equations. For example, if total cost t is proportional to the number n of items purchased at a constant price p, the relationship between the total cost and the number of items can be expressed as t = pn. d. Explain what a point (x, y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0, 0) and (1, r) where r is the unit rate. 
Download Common Core State Standards (PDF 1.2 MB) 

Tch SpecialCollaborating to Develop Mathematical Ideas: Series OverviewAll Grades / Math / Collaboration
 417
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Lesson Idea  Common CorePreparation for Fraction MultiplicationGrades 35 / Math / ScaffoldingMath.5.NF.B.4 / Math.5.NF.B.6
 178
 13

Planning/CollaborationReflecting on Teaching & Learning About FractionsGrades 35 / Math / Teacher CollaborationMath.5.NF.B.4 / Math.5.NF.B.6
 111
 2

Lesson Idea  Common CoreIntroduction to Ratios & Proportional RelationshipsGrades 68 / Math / ModelingMath.6.RP.A.3
 92
 18

Lesson Idea  Common CoreApplying Understanding of Ratios to FractionsGrades 68 / Math / ModelingMath.6.RP.A.2 / Math.6.RP.A.3 / Math.7.RP.A.2
 17
 7

Planning/CollaborationHigh School Mathematical ModelingGrades 912 / Math / PD
 76
 2

Lesson Idea  Common CoreModeling & Graphing RealWorld SituationsGrades 912 / Math / FunctionsMath.HSFIF.B.5
 26
 7

Lesson Idea  Common CoreReflecting on Teaching & Learning: ModelingGrades 912 / Math / Teacher CollaborationMath.HSFIF.B.4
 1
 6

Planning/CollaborationCollaborative Lesson PlanningGrades 912 / Math / FunctionsMath.HSFIF.B.4
 26
 7
Lesson Objective
Reflect on lessons about ratios and proportional relationships
Length
9 min
Questions to Consider
 How did the lesson change depending on each classroom context?
 What do the teachers learn from looking at student work?
 How do the teachers support each other and push each other's thinking?
Common Core Standards
Math.6.RP.A.2, Math.6.RP.A.3, Math.7.RP.A.2
Watch all the videos in this series:
Collaborating Around Math: Before, During, and After Lessons
Developing a Math Team: Online and In Person
Teacher & School Info

Crystal Morey

Jana Dean

Wendy L. Hughes
 School Details
 Enumclaw Middle School Enumclaw, WA
 Population
 460 students
 District Spending
 $8,204
Supporting Materials

Reflecting on Teaching & Learning: Ratios & Proportional Relationships Transcript.doc

Illustrative Mathematics