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Finding Perimeter of Irregular Shapes, 3rd Grade Math Worksheet
Five irregular shapes, five sets of labeled side lengths, and one clear instruction: show your work. This perimeter of irregular shapes worksheet gives your 3rd grader a concrete reason to add carefully.
Each problem on this perimeter of irregular shapes worksheet presents a labeled polygon with side lengths given in different units across the five problems, centimeters, meters, feet, and yards. Shapes include an L-shape, a trapezoid, two staircase-style figures, and a notched rectangle, all labeled with every side length your student needs. A reminder box at the top defines perimeter as the total distance around the outside, making this appropriate for 3rd graders who are just building fluency with the concept.
Students add all visible side lengths and record the total on the perimeter line beside each shape. The instruction to show work in the space provided encourages students to write out their addition rather than solve mentally, which is a useful habit to build at this grade level. Works well as independent seat work once you have walked through one example together, or as a check-in after a geometry unit study lesson on measuring and adding side lengths.
Five labeled irregular shapes make this perimeter of irregular shapes worksheet a solid 3rd grade math practice page. Add all side lengths to find each answer.
Working Through a Perimeter of Irregular Shapes Worksheet
Usage Notes
A pencil is the right tool here since students need room to show addition work in the space beside each shape. The problems are straightforward enough for independent practice once your homeschooler understands the concept, but the variety of unit labels across problems makes guided first-use worthwhile.
Printing Tips
Regular copy paper handles pencil work well for this one. Portrait orientation is already set, and printing two or three copies lets your student retry problems or track progress across separate attempts.