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Lesson Plan

1. Most Chocolatey Milkshake: Testing for equivalent ratios in a table

teaches Common Core State Standards CCSS.Math.Practice.MP2 http://corestandards.org/Math/Practice/MP2
teaches Common Core State Standards CCSS.Math.Practice.MP7 http://corestandards.org/Math/Practice/MP7
teaches Common Core State Standards CCSS.Math.Content.7.RP.A.2 http://corestandards.org/Math/Content/7/RP/A/2
teaches Common Core State Standards CCSS.Math.Content.7.RP.A.2a http://corestandards.org/Math/Content/7/RP/A/2/a
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This lesson builds on students’ work with ratio tables and generating equivalent ratios. The task presents students with three milkshake recipes. The students are asked to rank the recipes from “most chocolatey” to "least chocolatey.” When students compare the three ratios, they will notice that two of the recipes have the same ratio of chocolate ice cream to milk. This will provide an opportunity to discuss what a proportional relationship is and how to tell whether or not one exists. Students understand that in a proportion, the ratio of two quantities remains constant as the corresponding values of the quantities change. The mathematical concepts in this task build toward students’ future work with proportional relationships in graphs. Big Ideas: In a proportion, the ratio of two quantities remains constant as the corresponding values of the quantities change. Vocabulary: equivalent ratios, proportional relationship
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