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Grade 3 · Maths · Lessons
All the way round
🏃walk round🟫rug🏞️patio📏sides
All the way round.
The big ideaPerimeter is the way round. Add every side.

How it works

Perimeter is the distance all the way round a shape.

Add every side.

A rectangle has two long sides and two short sides.

Sides• 6 + 4 + 6 + 4Perimeter• = 20
A rug 4 by 6.

Example 1: A rug

  1. A rug is 6 feet long and 4 feet wide.
  2. Walk round: 6 + 4 + 6 + 4 = 20.
  3. The perimeter is 20 feet.

Example 2: A patio

  1. A patio is 8 meters long and 3 meters wide.
  2. 8 + 3 + 8 + 3 = 22.
  3. The perimeter is 22 meters.

Example 3: A card

  1. A card is 6 centimeters by 4 centimeters.
  2. 6 + 4 + 6 + 4 = 20.
  3. The perimeter is 20 centimeters.

Words to know

perimeter
The distance all the way round a shape.
side
A straight edge of a shape.

Watch out

Try it

  1. A square has sides of 5 cm. What is its perimeter?
  2. A rectangle is 7 by 3. What is its perimeter?
  3. Is perimeter added or multiplied?
  4. How many sides do you add on a rectangle?
Answers: 1. 20 cm · 2. 20 · 3. added · 4. 4
For grown-upsMeasure round a book with string and then find the sum of its sides.
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