Finding the Perimeter Activity
This finding the perimeter activity for 3rd and 4th grade has students find missing sides and match 12 shapes to their perimeters. Answer key included, so checking is quick.
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About this resource
Description
Perimeter is the distance all the way around a shape, and finding it is a big step in 3rd and 4th grade geometry. This finding the perimeter activity helps students find missing side lengths, add every side of a polygon, and check their thinking by matching each shape to the right perimeter.
The pack includes 12 Shape Cards with rectangles, squares, triangles, a pentagon, a trapezoid, a parallelogram and L-shaped figures. Some sides are marked with a question mark, so students use the opposite sides to find each missing length before they add. Students then match each Shape Card to one of 12 Perimeter Cards and record their work on the Recording Sheet. A 3rd grade practice worksheet follows, with four find-the-perimeter problems and two problems where the perimeter is given and students work back to find the missing side. This perimeter card game works well in math centers, small groups, partner practice or as a review before a test.
What’s Included
- A How to Use page with steps and prep tips
- 12 Shape Cards and 12 Perimeter Cards
- A Recording Sheet for 12 matches
- A 3rd grade practice worksheet with 6 problems
- A card answer key and a practice answer key
Why Kids Love It
- Matching cards turns adding side lengths into a game with a clear goal.
- Every Perimeter Card fits exactly one shape, so students can check their own answers.
- Missing sides make students think about how rectangles and L-shapes are built, not just add numbers.
Ideas for Teachers and Parents
Print the cards on cardstock and keep each set in a zip-top bag for a math center. Partners can take turns solving a Shape Card while the other checks the match. For an extra challenge, ask students to draw their own shape with one missing side and trade with a partner. At home, measure the sides of a table or a rug and use this finding the perimeter activity as a guide.
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