Finding the Perimeter of Shapes Grid Worksheet
The Finding the Perimeter of Shapes Grid Worksheet helps 3rd graders count grid units to find the perimeter of rectangles and an L-shape. Includes an answer key for quick, no-prep measurement practice.
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About this resource
Description
Perimeter is the total distance around the outside of a shape, and the Finding the Perimeter of Shapes Grid Worksheet gives third graders a clear, hands-on way to practice it. By counting the unit squares along each side of a shape drawn on a grid, students discover that perimeter is simply the sum of all the side lengths. This grid-based approach turns an abstract measurement idea into something students can see, trace, and count with confidence.
This 3rd grade measurement worksheet presents four different shapes—rectangles and an L-shape—each drawn on a one-centimeter grid. Students count the length of every side, add the lengths together, and write the total perimeter in centimeters on the line provided. To use it, print the page and have students trace each side as they count, then check their work against the included answer key. It works well as independent practice, a math-center task, or a quick review before a quiz.
What’s Included
- 1 print-ready PDF worksheet
- Answer key
- 4 grid perimeter problems (rectangles and an L-shaped figure)
There are three big reasons the Finding the Perimeter of Shapes Grid Worksheet helps students learn. First, the grid gives every side a countable length, so students build accuracy before moving to shapes with labeled measurements. Second, mixing rectangles with an L-shaped figure stretches students beyond memorized formulas and asks them to reason about every edge. Third, the built-in answer key lets students check themselves and lets teachers grade in seconds, keeping the focus on learning rather than correcting.
For more perimeter practice, have students use string or a ruler to measure the perimeter of real classroom objects like a book, a desk, or a picture frame. Challenge them to draw their own shapes on grid paper and trade with a partner to find each other’s perimeters. At home, families can hunt for rectangles around the house and count the units of masking tape it would take to outline them. These playful activities reinforce the same skill while keeping measurement fun and concrete.
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