Computing Actual Lengths from a Scale Drawing

The original drawing is eight units — how big is the scale drawing? Classmates determine the scale percent between a scale drawing and an object to calculate the length of a portion of the object. They use the percent equation to find both unknowns in the problems in the 15th installment in a 20-part series.

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CCSS: Designed
Instructional Ideas

  • Lead a discussion on which dimensions on a grid are the easiest to find
  • Use a scale drawing of the school to determine the dimensions of the classrooms
Classroom Considerations

  • The class should be familiar with finding scale factors
Pros

  • The answer key shows what measurements were used to find the scale factor
  • Includes anticipated class responses to questions asked during the discussion
Cons

  • None
Common Core