3rd Grade Perimeter of Shapes Worksheet
Find the perimeter — the distance around a shape — by adding all of its side lengths.
- Homework
- Review
- Test Prep
- Tutoring
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No sign-up required. Clean, low-ink US Letter format.
- Grade
- 3rd Grade
- Subject
- Math
- Skill
- Area & Perimeter
- Topic
- perimeter of rectangles and polygons
- Difficulty
- Standard
- Time
- 14 minutes
- Pages
- 2 (incl. answer key)
- Format
- Printable PDF (US Letter)
- Answer key
- Included
- Best for
- homework, review, test prep, tutoring
Worksheet details
What This Worksheet Practices
Students will find the perimeter of rectangles and other polygons by adding all the side lengths.
- Adding all side lengths
- Finding the perimeter of rectangles and polygons
- Telling perimeter apart from area
Worksheet Preview
Perimeter is the distance around
Perimeter is the total distance around a shape — found by adding up the lengths of all its sides. For a rectangle that means all four sides (both lengths and both widths), not just two. Keeping perimeter (around the edge) separate from area (the space inside) is the main goal at this grade.
How to use it
Have students label every side and add them all. For regular shapes, multiplying a side length by the number of sides is a shortcut. Pairs with area by counting squares and the area and perimeter worksheet.
👩🏫 Teacher note
Perimeter is the distance around the edge. For a rectangle, that's all four sides (two lengths and two widths). Have students label each side and add them all.
🏠 Parent note
Add up the length of every side. For a rectangle, add all four sides.
Common Mistakes to Watch For
- Adding only two sides of a rectangle
- Confusing perimeter with area
Answer Key
Each answer shows the perimeter with its unit.
⬇ Download Answer Key (PDF)Related Worksheets
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