Grade 2/Geometry
Perimeter on a Grid (387)
Count the units around a rectangle on a grid to find the perimeter.
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Quick Tip
Formula: P = w + h + w + h = 2 × (w + h)
Teacher Resources
Teaching Notes
Introduce perimeter as the distance around a shape. Emphasize counting each unit segment along the boundary. Encourage students to trace the path with a finger or pencil.
Vocabulary
Perimeter: The total distance around the outside of a shape.
Unit: A single square side on the grid.
Common Mistakes
- Counting interior squares (area) instead of boundary units (perimeter).
- Missing one or more sides when counting units around the shape.
- Counting vertices/corners instead of the unit segments along the sides.
Differentiation
SupportUse physical manipulatives or highlight units as they are counted.
ChallengeChallenge with irregular shapes or given perimeter, find possible dimensions.
Discussion Questions
- What does 'perimeter' mean in your own words?
- How is finding perimeter on a grid different from finding the area?
- Can two different rectangles have the same perimeter? Explain.
- Why is counting each unit segment important for accuracy?
Extension Activities
- Find shapes with the same perimeter.
- Draw shapes with a given perimeter.
- Calculate perimeter of real objects.
Parent Tip
Use string to measure the perimeter of objects around the house.
Learning Path
Skill Cluster
Measurement & Geometry
Estimated Time
15 minutes
Skills Practiced
calculate perimetercount grid unitsmeasure distance
Prerequisites
- Counting to 20
- Identifying rectangles
- Understanding length
Next Steps
- Perimeter using formulas
- Perimeter of compound shapes
- Area on a Grid
- Perimeter of Polygons
- Measuring Length