Perimeter on a Grid Worksheets for 3rd Grade
Find the perimeter of a shape drawn on a grid by counting the units along its edges. 15 free printable worksheets, each with an answer key.
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Click a worksheet to open the PDF, or grab the matching answer key. Every sheet prints on one page.
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Perimeter on a Grid: what children learn
On a grid, every side of a square is 1 unit long, so the perimeter is the number of unit lengths around the outline. Counting each side in turn and adding is the same as adding side lengths.
Perimeter on a Grid: worked example
A rectangle on a grid is 4 units long and 2 units wide. What is the perimeter? 12
The sides count as 4, 2, 4, and 2 units. 4 + 2 + 4 + 2 = 12, so the perimeter is 12 units.
Perimeter on a Grid: a common mistake to watch for
Kids sometimes count the squares inside the shape instead of the unit lengths around the outside.
Perimeter on a Grid: how to help at home or in class
Draw shapes on grid paper and trace the outline with a colored pencil, dotting each unit length as you count it. Then pose a challenge: draw a different shape that also has a perimeter of 12 units. A 3 by 3 square and a 4 by 2 rectangle both work. When your child counts the lengths around the edge rather than the squares inside, missing sides are next.
What is on these Perimeter on a Grid worksheets
This set has 15 different worksheets for 3rd grade, with 9 questions on each and a matching answer key for every sheet. The instruction printed on each worksheet is: “Count the units around each shape. Write the perimeter.”
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers