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Grade 4/Geometry

Finding Perimeter on Grids

Learn to find perimeter by counting squares around rectangles on a grid.
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Teacher Resources
Standards
CCSS.MATH.CONTENT.3.MD.C.5
Teaching 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