Lesson plan

6. Use rates to compare growth: Who grew faster? (Project MELD)

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teaches Common Core State Standards 6.RP.A.2 http://corestandards.org/Math/Content/6/RP/A/2
teaches Common Core State Standards MP4 http://corestandards.org/Math/Practice/MP4
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Lesson objective: Apply knowledge of unit rate to determine which sibling grew faster.

This lesson provides an opportunity for students to apply their knowledge and understanding of unit rate to a real-world situation. Students are asked to determine which sibling grew faster given data about height measurements and the year those measurements were taken.

Key Concept students will use: 

  • Every ratio can be associated with a unit rate; the ratio a:b is associated with the unit rate a:b/1.

Skills students will use:

  • calculating a unit rate given a ratio
  • comparing unit rates

Students engage in Mathematical Practice 4 (Model with mathematics) as they identify the important quantities on the height chart and map their relationships so they can draw conclusions about which child grew fastest. 

Key vocabulary: 

  • ratio
  • ratio table
  • unit rate