In plain English, a scale drawing is a drawing which has been reduced or enlarged from its original size, to a specified scale. The scale is a ratio of the size of the drawing to the size of the original object being drawn. This may be referred to as a scale ratio.
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Places |
Measurement |
Actual Distance |
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Kingston to Morant Bay |
20 cm |
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Santa Cruz to Christiana |
3 cm |
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Black River to Lacovia |
2 cm |
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FOLLOW UP PRACTICE EXERCISES
5E Mathematics Lesson Plan – Scale Drawing
Grade: 6
Duration: 1 hour
Topic: Scale Drawing
Focus Question: How do I calculate and use the various measurements around me?
Objective: Students will interpret a simple scale drawing and calculate actual distances using the scale on a road map or floor plan.
Engage (5 mins)
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Activity: Show students a Google Maps screenshot of a familiar area (school neighborhood) with a scale bar.
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Prompt Questions:
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What does this small line at the bottom mean?
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Why do maps use a scale instead of the actual size?
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Mini-discussion: Highlight real-life situations where scale drawings are used—blueprints, road maps, furniture layout.
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STEM Connection: Explain that engineers, architects, and surveyors use scale drawings to represent real structures accurately.
Explore (10 mins)
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Activity:
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Give students a simple floor plan of the classroom (1 cm = 1 m).
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Students measure a few distances on the plan (e.g., door to window, teacher’s desk to board).
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They convert measurements into actual distances using the given scale.
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Group Work: Students work in pairs with rulers and compare answers.
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STEM Link: Relate to how builders check actual building dimensions from blueprints before construction.
Explain (15 mins)
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Direct Teaching:
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Define scale and scale drawing.
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Explain the two main scale types: ratio form (e.g., 1:100) and word form (e.g., 1 cm represents 1 m).
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Show step-by-step:
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Measure drawing distance.
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Multiply by the scale factor to get actual distance.
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Reverse: Divide actual distance by scale factor to get drawing size.
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Example Problem:
A map scale says 1 cm = 5 km. The distance between two towns is 8 cm on the map.-
Actual Distance = 8 × 5 = 40 km.
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STEM Link: Discuss GPS devices and mapping software that apply scale conversions automatically.
Elaborate (15 mins)
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Activity – "Plan My Room"
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Students receive a mini floor plan of a bedroom with some distances labeled.
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They calculate actual distances.
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Extension: Students create their own mini plan of their dream bedroom at a chosen scale (e.g., 1 cm = 0.5 m).
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Differentiation:
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Tier 1 (Support): Provide scale already written and guide through calculations.
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Tier 2 (Core): Students calculate with given scale and unlabeled distances.
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Tier 3 (Challenge): Students choose their own scale and convert between different scales.
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Evaluate (15 mins)
Three-Tier Evaluation Activity
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Tier 1 (Basic Understanding):
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Given: Scale 1 cm = 2 km.
Q: If two points are 6 cm apart on the map, what is the actual distance?
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Tier 2 (Application):
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Given a simple road map, measure two towns 4.5 cm apart. Scale 1 cm = 3 km.
Q: What is the actual distance?
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Tier 3 (Reasoning & Extension):
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A playground is 40 m long in real life. You want to draw it on paper so that it’s 8 cm long.
Q: What is the scale of your drawing?
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Rubric:
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Mastery: Correct use of scale factor in all tasks.
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Proficient: Minor calculation error but correct method.
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Developing: Needs help identifying correct scale usage.
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Closure (5 mins)
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Recap: Why do we use scales? How do we find actual distances from drawings?
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Real-world link: Assign students to find a map at home or online and identify its scale for next class.
Materials Needed
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Rulers
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Printed maps/floor plans
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Pencils, erasers
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Google Maps screenshot with scale bar
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