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Grade 3 · Math · Unit 12 of 13

Area & Perimeter

Around and inside shapes

What your child practises

Finding the perimeter (distance around) of rectangles and triangles, finding a missing side, and measuring area in square centimetres and square metres.

Newfoundland and Labrador Curriculum curriculum outcome: Measurement (by Grade 3) · perimeter of regular, irregular and composite shapes

How we explain it

Children can open this short lesson before they practise.

  1. Perimeter is the distance around a shape. Add all sides.
  2. Area is the space inside. Count the square units.
  3. Perimeter uses cm. Area uses square cm.

Example: A rectangle is 5 cm long and 3 cm wide. What is its perimeter? Add all four sides: 5 + 3 + 5 + 3. That is 16 cm. Answer: 16 cm

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    A rectangle is 8 cm long and 3 cm wide. What is its area, in square centimetres?

    • 24
    • 23
    • 20

  2. Question 2

    Which unit is best for the area of a classroom floor?

    • metres
    • square centimetres
    • square metres

  3. Question 3

    A rectangle has a perimeter of 28 cm. It is 8 cm long. How wide is it, in centimetres?

    • 6
    • 3
    • 1

  4. Question 4

    A rectangle is 4 cm long and 2 cm wide. What is its perimeter in centimetres?

    • 14
    • 16
    • 12

  5. Question 5

    A rectangle is 5 cm long and 2 cm wide. What is its area, in square centimetres?

    • 8
    • 4
    • 10

  6. Question 6

    Which rectangle has the same area as a 2 by 8 rectangle?

    • 4 by 5
    • 4 by 4
    • 3 by 8

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