Computing Actual Areas from a Scale Drawing

Square the scale factor when working with scaled drawings and area. The 19th lesson plan in a series of 22 introduces calculating actual areas from scale drawings. The lesson plan encourages pupils to use the square of the scale factor to find the area. Scholars first find the area of the scale drawing and multiply it by the square of the scale to find the actual area.

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CCSS: Designed
Instructional Ideas

  • Lead a discussion on why pupils should square the scale factor by using area calculations
  • Using the apartment scale drawing, compare the area of the different rooms
Classroom Considerations

  • Each pair needs rulers
Pros

  • The answer keys for the in-class work shows the computations needed to arrive at the solution
  • Scaffolding provides hints for struggling pupils
Cons

  • None
Common Core