Lesson plan

Finding the part when the total and the percent are known by using a double number line

teaches Common Core State Standards CCSS.Math.Content.6.NS.B.3 http://corestandards.org/Math/Content/6/NS/B/3
teaches Common Core State Standards CCSS.Math.Content.6.RP.A.3c http://corestandards.org/Math/Content/6/RP/A/3/c
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
teaches Common Core State Standards CCSS.Math.Practice.MP8 http://corestandards.org/Math/Practice/MP8

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Big Ideas: Percent is relative to the size of the whole. This lesson builds on students' understanding of equivalent ratios and rates by applying the same reasoning to working with percentages. In this task, students compare how much money four shoppers save when buying bicycles by looking at the total cost of the bike and the percent discount. This lesson builds toward an understanding of sale price as compared to the original price, and compound interest that students will learn about in grade 7. Vocabulary: ratio, rate, percent, percent discount Special Materials: 100 grid (optional)