Perimeter · Grades 3–5
Perimeter Worksheets
Trace a finger all the way around the shape and add up what you cross. Printable perimeter worksheets for squares and rectangles.
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What it is
Perimeter is the total distance around the outside of a shape, the sum of all its side lengths.
Why it matters
Picture fencing a yard: what matters is the total length of fence, not the space inside it. That's perimeter, and tracing the outline first is what makes the idea concrete before the formula takes over.
How to do it
- Find the length of every side.
- Add all the side lengths together.
- For a rectangle use 2 × (length + width); for a square use 4 × side.
Examples by level
- BeginnerFind the perimeter =Answer8 cm
- IntermediateFind the perimeter =Answer12 cm
- AdvancedFind the perimeter =Answer100 cm
Examples are generated by the same engine as the worksheets, so they're always mathematically correct. Built to avoid repeats, not reshuffle the same handful of questions.
Common mistakes
- Adding only two sides of a rectangle instead of all four.
- Confusing perimeter with area.
- Using square units (cm²) for a length.
Tips
- Perimeter is a length, so the unit is cm (not cm²).
- Opposite sides of a rectangle are equal.
For parents
Trace a finger all the way around the shape, perimeter is that whole trip.
For teachers
Contrast perimeter and area on the same rectangle so students keep the units straight.
Key vocabulary
- perimeter
- the distance around a shape
- side
- one edge of a shape
Frequently asked questions
- How do you find the perimeter of a rectangle?
- Add all four sides, or use 2 × (length + width).
- What unit is perimeter measured in?
- A length unit like cm or m, not square units.
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