Enlargements and reductions are all about scale. The lesson introduces scale drawing to the class. Pupils determine whether the drawing is a reduction or an enlargement, and the constant of proportionality between the original and the drawing. The lesson is the 16th part of a 22-part series.

Concepts

scale drawings, scale, scale factors, ratios, rates, proportional reasoning, reduction

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Additional Tags

math

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Instructional Ideas

• Have the class look through popular magazines and find scale drawings, and determine whether they are enlargements or reductions

Classroom Considerations

• The class should be familiar with finding ratios
• Consider using a different map that may be more familiar to the class than a subway map

Pros

• Includes images to project to demonstrate scaling
• The handout includes the lesson summary

Cons

• None

Common Core

7.G.A.1 MP2