Free worksheets · Grade 3
Perimeter of Rectangles Worksheet
Write an equation that adds all four sides of each rectangle, then solve it to find the perimeter.
Free printable
Perimeter of Rectangles
6 questions, one page, US Letter. Print it and do it on paper.
On the sheet: Perimeter is the distance all the way around a shape. Add all four sides: the two long sides and the two short sides.
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About this worksheet
Perimeter is the distance all the way around a shape. For a rectangle, that is two long sides and two short sides.
Each rectangle is labeled with just one long side and one short side, because the opposite sides of a rectangle are equal. Part of the skill is knowing there are four sides to add, not two.
A worked example
A rectangle is 14 in long and 2 in wide. What is its perimeter?
- The two long sides: 14 + 14 = 28.
- The two short sides: 2 + 2 = 4.
- Write it as one equation and solve it: 14 + 2 + 14 + 2 = 32.
Answer: 32 in
The common mistake
What it looks like: Adding only the two labeled sides: 14 + 2 = 16 in.
Why it happens: The picture shows two numbers, so children add two numbers.
How to fix it: Trace around the rectangle with a finger and say a length for each of the four sides before adding.
Ten minutes a day, on paper. We plan what comes next.
A printed page and a pencil. No screen, no login for your child. Snap a photo when they’re done: AI scores it, and what they missed comes back on the sheets that follow.
- Mon Perimeter of Rectangles
- Tue What they missed, back again
- Wed The next step, when they’re ready
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