Grade 4/Geometry
Finding Perimeter on Grids (705)
Learn to find perimeter by counting squares around rectangles on a grid.
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Standards
CCSS.MATH.CONTENT.3.MD.C.5Teaching Notes
Emphasize counting each unit segment along the boundary. Relate perimeter to 'distance around' a shape.
Vocabulary
Perimeter: The distance around a shape.
Unit segment: One length on the grid.
Common Mistakes
- Forgetting to count both top and bottom (or both sides)
- Adding area instead of perimeter
- Counting grid lines instead of squares between lines
- Counting corners twice
- Missing a side segment
- Confusing with area
- Counting internal squares
Differentiation
SupportUse fingers to trace and count each unit segment.
ChallengeDraw shapes with specific perimeters; explore different shapes with same perimeter.
Discussion Questions
- What does 'perimeter' mean in your own words?
- How is finding perimeter on a grid different from finding area?
- Could two different shapes have the same perimeter?
- Why is counting each segment important?
Extension Activities
- Find perimeter of squares.
- Find perimeter of irregular shapes.
- Calculate missing side lengths.
Parent Tip
Measure the perimeter of a rug or tabletop using a ruler.
Learning Path
Skill Cluster
Measurement & Geometry
Estimated Time
10 minutes
Skills Practiced
Counting squares along rectangle sidesAdding four numbers to find perimeterUnderstanding perimeter as distance around a shapeUsing grids for visual measurement
Prerequisites
- Understanding length units
- Basic counting skills
Next Steps
- Perimeter of polygons from given side lengths
- Perimeter of irregular shapes on grids
- Finding Area on Grids
- Perimeter of Polygons
- Perimeter Word Problems