Classmates create a scale drawing from another scale drawing, changing the scale in the process. Groups enlarge or reduce the scale of the drawing and discuss their processes.

Concepts

scale drawings, scale, scale factors, constant of proportionality, proportional reasoning, proportions

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Additional Tags

math

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Instructional Ideas

• Spend some time confirming that the two methods of finding the new scale factor arrive at the same answer
• Lead a discussion on precision and which approach would be best for different projects

Classroom Considerations

• It is beneficial if the class has done the lesson, An Exercise in Creating a Scale Drawing
• The lesson is the 21st portion of a 22-part series

Pros

• Includes a sample scale drawing to use if a pupil did not complete one
• The lesson summary provides an example to illustrate the central concept

Cons

• None

Common Core

7.G.A.1 MP1 MP2