Lesson plan

Can Conundrum: Analyzing a proportional relationship with like units and compute the ratio by using a ratio table and the multiplicative inverse

teaches Common Core State Standards CCSS.Math.Content.7.RP.A.1 http://corestandards.org/Math/Content/7/RP/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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This lesson builds on students understanding of ratios by using a recipe context for calculating unit ratios from fractional amounts. Students use ratios and proportional reasoning to correct a cooking error which relates to unit ratios. Students can use strategies such as making a table or multiplying by the inverse. This builds toward finding unit rates and ratios using fractional amounts as well as applying understanding of fraction multiplication and division. Big Idea(s): Recognize that the relationship between the quantities in a ratio is proportional and can be expressed using multiplicative reasoning. Compute a unit ratio from fractional amounts by using a ratio table or the multiplicative reasoning. Vocabulary: multiplicative inverse, ratio table, reciprocal