Wilderness Park Architects Teacher Guide Wilderness Park Architects
3rd Grade Math Lesson Plan Summary
Lesson Summary
Students serving as Head Architects must save "Emerald Hollow" by designing a precise park map. Using a 1x1 foot grid scale, students calculate Area and Perimeter for 5 distinct zones. The lesson focuses on the transition from counting unit squares to using multiplication (Length x Width) while solving real-world boundary problems.
30 Mins Area & Perimeter Scaling
OR Standards
• 3.GM.C.8: Measure area by counting unit squares (sq ft).
• 3.GM.C.9: Relate area to multiplication and addition.
• 3.GM.C.10: Solve real-world perimeter problems.
*Aligned to Oregon 2021 Math Standards
30-Minute Pacing Guide
0-5m
Direct Instruction: The Briefing
Read the Chief Ranger Oakley Letter . Use Slides 1-4 to define Area (tiling) and Perimeter (fence). Introduce the 1x1 Scale.
5-22m
Guided Practice: Blueprint Phase
Pairs design 5 rectangular zones. Monitor for 3.GM.C.9 mastery (multiplying dimensions rather than just counting).
22-30m
Closing: Ranger Review
Compare results (e.g., 9x8 vs 6x12). Students complete the Exit Ticket independently for assessment.
Scale & Units
Key Teaching Point: 3rd graders often confuse linear units (ft) with square units (sq ft). Emphasize that Area measures "how many tiles" while Perimeter measures "how many steps."
Shape Analysis
"If two zones have an Area of 72, which one needs more fence?"
Show students that long, narrow rectangles (e.g., a 12x6 trail) have larger perimeters than "chunkier" rectangles (e.g., a 9x8 playground).
Architect's Checklist
Briefing Letter
Designer Worksheet
Slides (6 Slides)
Model Map
Exit Ticket
Answer Key
Wilderness Park Architects Slides Wilderness Park Architects
Emergency Blueprint Mission
The Story
"Last week, the crew tried to build a picnic area without a map. They ended up building right in the middle of a muddy swamp!"
— Chief Ranger Oakley
Ranger Oakley needs Master Architects to draw a perfect map of Emerald Hollow.
Your Mission:
Fit all 5 zones onto one map with Perfect Math.
Architect's Tools
AREA
The INSIDE floor. Count every square unit!
Surface
PERIMETER
The OUTSIDE fence. Add up the edge lengths!
The Edge
The Secret of Scale
Scaling is a "shrinking ray" for math!
Every 1 square on our paper map represents 1 square foot in the real wilderness.
Map Grid
1 sq = 1 sq ft
Architect's Model
Playground
9' x 6'
Main Trail (11' x 2')
Garden
Sample Park Blueprint
Expert Tips:
Math Masterclass
Zone: Nature Reserve
9 ft by 8 ft
Area
72 Sq Ft
9 x 8 = 72
Perimeter
34 Ft
9 + 9 + 8 + 8 = 34
Wilderness Park Architects Worksheet Wilderness Park Architects
Project ID: #WP-2026 | Emerald Hollow Mission
Architects: ___________________________
Date: ___________________________
"Architects, Ranger Oakley needs a precise blueprint of Emerald Hollow so the construction crew can start building. Use scale to draw your plans!"
Blueprint Mission: Draw 5 required park zones on the grid. Every zone must be a single rectangle. Use different colors to show where each area belongs!
West Boundary
East Boundary
North Boundary
South Boundary
Architectural Specifications
Park Zone Dimensions (ft) Total Area (sq ft) Total Perimeter (ft) Playground
| ______ x ______ | ____________ | ____________ |
|
Trails
| ______ x ______ | ____________ | ____________ |
|
Garden
| ______ x ______ | ____________ | ____________ |
|
Picnic Area
| ______ x ______ | ____________ | ____________ |
|
Nature Reserve
| ______ x ______ | ____________ | ____________ |
Architect's Post-Project Review
"Imagine a 20x30 rectangular zone and a 15x40 rectangular zone. Both have an area of 600 sq ft. Which one needs more fencing (perimeter)? Why do you think that is?"
Wilderness Park Architects Exit Ticket Architect Exit Ticket
Wilderness Park Mission (Larger Numbers)
Name: ________________________
1. The Park Ranger wants to put wood chips all over the floor of the Playground. Which measurement does he need?
Perimeter (The Edge)
Area (The Inside)
8 ft
6 ft
2. Calculate for this Garden:
Area: sq ft
Perimeter: ft
3. TRUE or FALSE? "Two different zones can have the same Area, but different Perimeters."
TRUE FALSE
✂
Architect Exit Ticket
Wilderness Park Mission (Larger Numbers)
Name: ________________________
1. The Park Ranger wants to put wood chips all over the floor of the Playground. Which measurement does he need?
Perimeter (The Edge)
Area (The Inside)
8 ft
6 ft
2. Calculate for this Garden:
Area: sq ft
Perimeter: ft
3. TRUE or FALSE? "Two different zones can have the same Area, but different Perimeters."
TRUE FALSE
Wilderness Park Architects Exit Ticket Answer Key Answer Key
Wilderness Park Architects Exit Ticket (Larger Numbers)
1
Wood chips for the Playground floor?
Area (The Inside)
2
Calculate the Garden zone (8 ft x 6 ft):
Area: 48 sq ft (8 x 6 = 48)
Perimeter: 28 ft (8+8+6+6 = 28)
3
"Same Area, different Perimeters?"
TRUE
Example: A 9x8 rectangle and a 6x12 rectangle both have an Area of 72. But the 9x8 has a Perimeter of 34, while the 6x12 has a Perimeter of 36.
Common Misconception
When using larger numbers, students might make addition errors in perimeter. Remind them to add all 4 sides!
Wilderness Park Architect Model Example Architect's Model Map
Larger Scale Exemplar for Wilderness Park
Scale
1 Square = 1 sq ft
Playground
9' x 8'
Garden
7' x 10'
Picnic Area
6' x 12'
Nature Reserve
10' x 5'
TRAIL
West
East
North
South
Larger Number Comparison
Calculating Area (Sq Ft)
Playground (9x8): 9 x 8 = 72 sq ft
Picnic (6x12): 6 x 12 = 72 sq ft
Both have an Area of 72, but look different!
Calculating Perimeter (Ft)
Playground (9x8): 9+9+8+8 = 34 ft
Picnic (6x12): 6+6+12+12 = 36 ft
Even with same Area, the Picnic area needs more fence!
Playground
Garden
Picnic
Trail
Nature Reserve
Wilderness Architect Briefing Letter Oregon Parks Department
Official Correspondence
PROJECT: #WP-2026
May 9, 2026
To the Lead Architects of Grade 3,
Deep in our Oregon wilderness, there is a hidden valley called Emerald Hollow. For years, only the owls and the deer have seen its beautiful meadows.
The town wants to turn this valley into a park, but we have a huge problem. Last week, a crew tried to build a picnic area without a map. They ended up putting tables in a swamp!
Chief Ranger Oakley is worried. Without a precise blueprint, our valley will be a mess! We need experts who understand the "Secret of Scale"—someone who can take huge measurements and fit them onto paper.
Your Urgent Mission:
Design a map with 5 zones. Calculate every inch of "floor" (Area) and every foot of "fence" (Perimeter) so our crew doesn't run out of materials!
Architects, the construction trucks are idling at the edge of the woods. Are you ready to save Emerald Hollow?
Sincerely,
Chief Ranger Oakley
Head of Oregon Wilderness Projects
Approved for
