Adding Perimeters Worksheet
This adding perimeters worksheet has 3rd graders find the perimeter of two rectangles or squares and add them for a total. An answer key is included for quick, easy checking.
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About this resource
Description
This adding perimeters worksheet helps 3rd grade students practice finding the perimeter of a shape and then combining two perimeters into one total. Perimeter is the distance all the way around a flat shape, and it is found by adding the lengths of every side. Students learn that a rectangle has two pairs of equal opposite sides and that a square has four equal sides, so a single labeled length can tell them the length of a side that is not labeled.
The adding perimeters worksheet has four problems. Each problem shows two shapes, Shape A and Shape B, drawn to scale with their side lengths labeled in feet, centimeters, inches or meters. Students find the perimeter of Shape A, find the perimeter of Shape B, and then add the two perimeters to get the total perimeter. Each answer line is followed by its unit, so students also see that perimeter is measured in linear units. Have students work through one problem at a time, writing the side lengths around each shape before they add. This makes the sheet a great fit for 3rd grade perimeter addition practice in class, in a math center, or as homework.
What’s Included
- One page with four adding perimeters problems (eight rectangles and squares)
- Labeled side lengths in feet, centimeters, inches and meters
- Answer rows for Shape A, Shape B and the total perimeter
- An answer key page with every perimeter and total
Why This Worksheet Helps Kids
First, it builds a real understanding of perimeter as the sum of all the sides, not just a formula to memorize. Second, it is a true multi-step task, because students must find two perimeters before they can add them, which strengthens planning and addition skills. Third, it reinforces the properties of rectangles and squares, since students use equal opposite sides to fill in the sides that are not labeled.
Ideas for Teachers and Parents
Before starting, trace the edge of a classroom rug or a book with a finger and talk about walking all the way around it. Encourage students to mark each side with a small tick as they add it so no side is missed. At home, measure two picture frames or two placemats with a ruler, find each perimeter, and add them together to see how much ribbon it would take to go around both.
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