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Learning Goal
1 of 3 in this cluster›
Solve problems involving scale drawings of geometric figures
Start lessonBegins with Scale drawings · Slides
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
- Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
- Guided Notes →One page your students fill in and keep.
- Exit Ticket →Three items at the end of class. No student accounts.
- Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
- Homework →Assign practice; it grades itself.
7.G.A.1
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What you'll learn
- Interpret a scale drawing by identifying the scale ratio and explaining what it means in context (e.g., 1 cm on the drawing represents 5 m in reality).
- Use the scale ratio as a proportional relationship to compute actual lengths from measured drawing lengths.
- Use the scale ratio to compute drawing lengths from known actual lengths (the reverse direction).
- Compute the actual area of a figure from a scale drawing, recognizing that area scales by the square of the linear scale factor.
- Reproduce a given scale drawing at a new (larger or smaller) scale by computing new drawing lengths systematically.
- Solve multi-step real-world problems involving scale drawings, including floor plans, maps, and architectural diagrams.
Slides
Step through the lesson, or watch it as a narrated video • 2 slide decks
1
Scale drawings
✓ Start here2
Scale areas reproduction
Practice
Try it on your own
Animated Videos
Short animated explanations of the key idea • 4 animated videos
What a Scale Tells You About the Whole Drawing
Computing Lengths Across a Scale, in Both Directions
Why Scaling Every Length by k Scales the Area by k Squared
Redrawing a Scale Drawing at a Different Scale
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