Lesson plan

# 9. Areas of scale drawings relate by the square of the scale factor (A)

teaches Common Core State Standards CCSS.Math.Content.7.G.A.1 http://corestandards.org/Math/Content/7/G/A/1
teaches Common Core State Standards CCSS.Math.Practice.MP6 http://corestandards.org/Math/Practice/MP6

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Lesson objective: Apply scale factors to find the areas of scale drawings.

This lesson provides an opportunity for students to apply their knowledge and understanding of scale drawings to a real-life situation. Students are asked to determine the amount of flooring needed to cover the floors in a home from a blueprint.

Key Concept students will use:

• Areas of pairs of scaled figures are related by the square of the scale factor.

Skills students will use:

• measurement conversions (Grade 6, Unit 1)
• scaling by a scale factor
• finding area (Grade 5, Unit 15)

Students engage in Mathematical Practice 6 (Attend to precision) as they convert between standard units (feet to inches etc). Students also engage in Mathematical Practice 8 (model with mathematics) as they use, create or reason about the relationship between a drawing and a real life object.

Key vocabulary:

• original figure
• proportions
• scale drawing
• scale factor
• unit conversions