Perimeter of Rectangles Worksheets for 3rd Grade
Find the perimeter of a rectangle from its length and width. 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 of Rectangles: what children learn
A rectangle has two pairs of equal sides, so its perimeter is length + width + length + width. Some pictures label only two touching sides; the other two sides match them.
Perimeter of Rectangles: worked example
A rectangle is 7 units long and 3 units wide. What is the perimeter in units? 20
The sides are 7, 3, 7, and 3. Add them: 7 + 3 + 7 + 3 = 20. The perimeter is 20 units.
Perimeter of Rectangles: a common mistake to watch for
Kids often add only the length and the width, forgetting the two sides that are not labelled.
Perimeter of Rectangles: how to help at home or in class
Measure just the long edge and short edge of a book cover, and ask your child to predict the full distance around before checking with a string laid along every edge and straightened against a ruler. Talk about why doubling works for a rectangle. When your child brings every side into the sum without being reminded, try finding perimeter on a grid.
What is on these Perimeter of Rectangles 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: “Use the length and width to find the perimeter in units.”
Every answer on every sheet is checked by a separate program before the worksheet is published. How we check answers