Finding the Perimeter Worksheet
This finding the perimeter worksheet gives 3rd grade students six labeled shapes plus a sandbox border problem to solve. An answer key is included, so checking work is fast and easy.
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About this resource
Description
Perimeter is the distance all the way around a flat shape, and it is one of the first measurement ideas that ties geometry to real life. This Finding the Perimeter Worksheet helps third graders practice adding side lengths to measure the path around triangles, rectangles, pentagons, hexagons, parallelograms and an L-shaped figure, always writing the answer with the correct unit.
Students begin by reading a short definition and a three-part strategy chart that shows how to add all the sides, how to use 4 × side for a square, and how to add two lengths and two widths for a rectangle. In Part A they find the perimeter of six labeled shapes using inches, centimeters, feet, meters and yards. In Part B they work backward: a sandbox border is 30 feet long in all, one side is known, and students find the missing width and explain their steps. Use the page for independent practice, a math center, homework or a quick check after a lesson.
What’s Included
- One printable finding the perimeter worksheet with six labeled polygons
- A strategy chart for any shape, squares and rectangles
- A missing side length word problem with a written explanation
- A complete answer key
Why This Worksheet Helps Kids
First, every shape shows all of its side lengths, so students build the habit of adding every side exactly once instead of guessing. Second, mixing units reminds children that a perimeter is a length and always needs a unit. Third, the sandbox problem asks students to think in reverse, which builds the reasoning they need for multi-step measurement problems on state tests.
Ideas for Teachers and Parents
Before handing out this 3rd grade perimeter worksheet, have students walk the edge of a rug or table and count their steps to feel what perimeter means. Encourage them to tick off each side with a pencil as they add it. At home, measure a picture frame, a garden bed or a sandbox with a tape measure and find its perimeter together. For an extra challenge, ask students to draw two different rectangles that both have a perimeter of 24 units.
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