Lesson plan

Compare prices of different numbers of objects by looking at unit rates

teaches Common Core State Standards CCSS.Math.Content.6.NS.B.4 http://corestandards.org/Math/Content/6/NS/B/4
teaches Common Core State Standards CCSS.Math.Content.6.RP.A.2 http://corestandards.org/Math/Content/6/RP/A/2
teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7

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Big Ideas: Unit rates answer the question how many (or how much) for 1. There are two unit rates for every rate relationship. Often, one of these unit rates is more helpful than the other in comparing rates. Reasoning with ratios involves paying attention to and ordering two or more quantities. This lesson builds on students' work with finding equivalent fractions, and understanding ratios as a comparison of two quantities using division. In this lesson students will compare the prices of different numbers of carnations to help a young entrepreneur, Alisher, set a reasonable price to sell his carnations to his classmates at school. Students are asked to look at the two unit rates that describe every rate relationship, and decide which one is best when advertising Alisher's carnations, and how much different numbers of carnations will cost. This task builds towards an understanding of unit rates, and leads to an understanding of proportional reasoning that they will learn in grades 7 and 8. Vocabulary: ratio, rate, unit rate, table, double number line, table Special Materials: Unifix cubes (optional) Pattern blocks (optional)