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8 questions with a Sports theme plus a full answer key. Perfect for Grade 3 Math.
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About this Math worksheet for Grade 3
Grade 3 math worksheet on perimeter with a sports theme. Free printable with answer key.
This printable Math worksheet is designed for Grade 3 students and covers Perimeter. The Sports theme keeps kids engaged while they practice essential Math skills. Every worksheet includes a full answer key making it easy for parents and teachers to check work instantly. Aligned to Common Core State Standards (CCSS) for Grade 3 Math. Print-ready at US Letter size. No login required — download and print in seconds.
Last updated: March 2026
Why Perimeter matters in Grade 3
Perimeter is the distance around the outside of a shape, and it's a foundational geometry skill that helps third graders understand how shapes work in the real world. At ages 8-9, students are developing logical thinking and the ability to break problems into smaller steps—both skills that perimeter practice strengthens. When children measure around rectangles, squares, and other shapes, they're connecting abstract math to something they can see and touch. This skill prepares them for more advanced geometry and real-world applications like figuring out how much fencing a garden needs or how far someone runs around a basketball court. Learning to add up all four sides (or all the sides of any shape) builds number fluency and careful attention to detail. Perimeter work also reinforces the difference between area and perimeter, a distinction that often confuses older students if not solidified now.
What your student will practice
- Add the lengths of all sides of a rectangle or square correctly
- Identify and measure the sides of basic two-dimensional shapes
- Write a perimeter answer with correct units of measurement
- Apply perimeter reasoning to solve simple real-world word problems
Common mistakes to watch for
The most common mistake is that students forget to count one or more sides when adding up the perimeter, especially on rectangles where they might count only three sides. You'll spot this when their answer is noticeably smaller than it should be—for example, adding 5+5+3 instead of 5+5+3+3 for a rectangle. Another frequent error is adding the numbers without units or writing the wrong unit (like saying '16' instead of '16 inches'). Watch for students who confuse perimeter with area and try to multiply two sides instead of adding all of them.
Teacher & Parent Tip
Ask your child to help you plan a small garden bed, sandbox, or play area at home by measuring the sides and calculating perimeter together. Have them measure with a ruler or measuring tape, write down each side length, and then add them up to find the total distance around. This makes perimeter concrete and purposeful—they'll see why knowing the perimeter matters when you actually need to buy fencing or rope to go around something real.
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