Perimeter Grids Worksheet
This perimeter grids worksheet gives 3rd grade students seven shapes on unit grids to count and one rug problem to solve. An answer key is included, so kids build real confidence measuring around any shape.
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About this resource
Description
The perimeter grids worksheet gives students a clear, hands-on way to understand what perimeter really is. Perimeter is the distance all the way around the outside of a shape, and the easiest place to see that distance is on a grid, where every square is exactly one unit long. When a shape is drawn on grid paper, the child can put a finger on one corner, travel around the edge, and count the units one at a time. That simple act turns an abstract measurement idea into something a third grader can see, touch, and check.
This printable is built around seven figures drawn on unit grids, plus one real-world problem. Part A holds four straightforward figures: a staircase, a square, a long rectangle, and an L-shape. Part B raises the challenge with three compound figures that turn in and out, so a student cannot simply measure the outside of a rectangle. They have to follow the boundary into each notch and back out again. Part C asks students to find how much braided edging runs around a rug, then explain in writing how they found the answer. Print the page, hand out pencils, and let students count. The answer key is included on the second page.
What’s Included
- One printable worksheet page plus a full answer key
- Part A: four simple figures on unit grids
- Part B: three compound figures with notched edges
- Part C: a real-world rug problem with a written explanation
- Answer boxes sized for third grade handwriting
Three Reasons This Helps Kids
- Counting units on a grid makes perimeter concrete before formulas appear
- The notched figures teach students to follow a boundary instead of guessing
- Writing an explanation builds the reasoning that state tests ask for
Teacher and Parent Ideas
Use this perimeter grids worksheet as a warm up before a lesson on adding side lengths, or as a quick check after one. Ask students to trace each boundary with a highlighter before they count, which stops the common mistake of counting squares instead of edges. Pair students and have each partner count a different figure, then compare totals and talk through any difference. For an extension, hand out grid paper and challenge students to draw their own shape with a perimeter of exactly twenty units, then trade papers and check. A finding perimeter worksheet like this one also works well in a math center, on a clipboard during small group time, or as homework that parents can check against the key.
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