Scale Community Plans

Overview

In this second lesson of Design a Sustainable Community, students apply ratios and rates to represent a real community space accurately. They measure an outdoor or classroom area, select and justify a scale, convert dimensions, and produce a labelled scaled site plan.

Learning intentions

• WALT use ratios and scale to represent a community space accurately.
• WALT convert real measurements into scaled measurements.
• WALT create and communicate a clear site plan using appropriate units.
• WALT review whether a chosen scale is practical for the purpose.

Success criteria

• I can select an appropriate scale for my plan.
• I can calculate scaled dimensions accurately using a ratio or rate.
• I can draw and label a clear plan using a ruler and correct units.
• I can explain why my scale is suitable and identify any limitations.

Curriculum links

• Measurement — use mathematical modelling to solve practical problems involving ratios and rates, including financial contexts.
• Measurement — recognise and use rates to compare two related quantities with different units.
• Measurement — solve problems involving the area and perimeter of irregular and composite shapes.
• Mathematical reasoning and communication — interpret, review and communicate solutions in context.

Lesson structure (90 minutes)

1. 0–8 min · Hook and prior knowledge. Open with the visual scale hook and learning intentions showing a large community park beside a small site plan. Ask, “How can a plan fit a real space onto one sheet without losing accuracy?” Students estimate what a scale such as 1 cm represents and share examples of maps, models or recipes that use scale or ratios.

2. 8–20 min · Explicit teaching. Use the worked scale examples to model the relationship between a real measurement and a drawing measurement. Demonstrate that a scale of 1 cm: 2 m means every 2 metres in the space is represented by 1 centimetre on the plan. Model converting 8 m to 4 cm, recording units at every step, and checking by multiplying back. Students complete two guided examples on mini-whiteboards and explain the conversion in words.

3. 20–32 min · Practical measurement. Explain the task using the measurement instructions and safety reminder. In three pairs, students measure a defined community space outdoors or in the room, such as a courtyard, reading area or garden zone. They record length, width, fixed features, entrances and obstacles on the measurement section of the sustainable community scale-plan worksheet. Rotate roles so each student measures, records and checks at least once.

4. 32–45 min · Choose and test a scale. Give each pair a copy of the ratio table and double number line mat. Students test two possible scales, complete equivalent measurements, and decide which scale will fit the available planning grid while remaining detailed enough to show features. Confer with each pair: “What is the largest real dimension?” “How much space will it occupy on paper?” “Will your labels still be readable?” Students record and justify their selected scale on the worksheet.

5. 45–70 min · Create the scaled site plan. Revisit the site-plan checklist and model. Students use rulers and grid paper to draw the boundary, convert and plot measured dimensions, and add at least three appropriate community features, such as paths, seating, shade, garden beds, water collection or waste stations. They label every feature, include a title, scale statement, legend and units. The teacher checks one conversion from each pair before students continue and prompts them to verify dimensions by measuring their drawing.

6. 70–82 min · Peer review and improve. Display the review questions in the peer-feedback prompts. Pairs exchange plans with another pair and check scale consistency, calculations, labels, units, neatness and practical fit. Each reviewer gives one specific commendation and one improvement suggestion. Students make corrections and annotate one change they made after feedback.

7. 82–90 min · Plenary and exit check. Use the reflection and exit questions. Students individually answer on the final section of the worksheet: “A path is 14 m long. At a scale of 1 cm: 2 m, how long is it on the plan?” and “Why might a different scale be more practical?” Invite two students to explain their reasoning, then preview that the next lesson will use plans to investigate area and perimeter.

Resources

• the scale drawings teaching deck
• the sustainable community scale-plan worksheet
• the ratio table and double number line mat
• Measuring tapes or metre rulers
• Rulers, pencils, erasers and coloured pencils
• Grid paper or squared planning paper
• Clipboards for outdoor measurement
• Mini-whiteboards and pens
• Calculators, if required for checking

Assessment

• Listen for accurate use of ratio language and check students’ guided conversions on mini-whiteboards.
• During measurement and planning, assess whether students record units, select a sensible scale and verify calculations.
• Collect the worksheet and site plan, including the exit response, to assess accuracy, communication and justification.

Differentiation

• Support learners with a partially completed plan, a conversion example, grid paper, a ratio table and sentence starters such as “My scale is suitable because…”.
• Pair learners strategically for peer teaching; allocate roles and provide measuring tapes with clear unit markings. Allow calculators for checking rather than replacing reasoning.
• For EAL learners, use visual examples and consistent terms such as real length, drawing length, scale, feature and unit; demonstrate each instruction before students begin.
• Extension: students create a second version using a different scale, compare the two plans, and justify which is most practical by considering detail, available space and readability.

Extension

• Calculate the real perimeter of the planned space and compare it with the perimeter shown on the drawing.
• Add a proposed feature with a fixed real dimension and explain how its size changes under both scales.
• Write a short design recommendation explaining which scale should be used for presenting the plan to a community group.