# 3. Resize photos using proportional reasoning (A)

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.MP4 http://corestandards.org/Math/Practice/MP4

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Lesson objective: Solve problems involving proportional relationships.

This lesson provides an opportunity for students to apply their knowledge and understanding of proportional relationships to a real-life situation. Students are asked to resize photos to a certain length for a photography exhibit.

Key Concept students will use:

• In a proportional relationship, as one quantity changes, the other quantity changes in a way that preserves the multiplicative relationship.

Skills students will use:

• Creating ratio tables to scale dimensions up and down

Students engage in Mathematical Practice 4 (Model with mathematics) as they identify important quantities of the pictures and frame and map their relationships using models and ratio tables.

Key vocabulary:

• proportion
• ratio table
• scale up / scale down

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