Lesson plan

6. Find missing values in ratio relationships (MELD)

teaches Common Core State Standards CCSS.Math.Content.6.RP.A.3a http://corestandards.org/Math/Content/6/RP/A/3/a
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5
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Lesson objective: Use multiplicative "between" and "within" relationships to find missing values in a table. 

This lesson helps to build fluency with finding missing values in a ratio table. Ratio tables are used here because they highlight the multiplicative relationship between values in a ratio. This work develops students' understanding that a ratio is a comparison by division and that equivalent ratios have the same multiplicative "between" and "within" values.

Students engage in Mathematical Practice 5 (use appropriate tools strategically) as they use ratio tables to find and use the multiplicative relationships in ratios.

Key vocabulary:

  • "between" relationship
  • multiplicative
  • ratio
  • "within" relationship