Measuring Perimeters · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Measuring Perimeters

Mathematics · Measurement · ages 7-8
Name ______________________   Date ____________

  1. True or false: the perimeter of a shape is the total distance all the way around its outside edge.

    Circle one:   True   False

  2. A rectangle has one side that is 6 cm long and another side that is 3 cm long. What is the perimeter in centimeters?

    Answer: ______________

  3. A rectangle has a length of 9 cm and a width of 2 cm. What is its perimeter?

    Answer: ______________

  4. A rectangle's sides are 5 cm, 2 cm, 5 cm, and 2 cm. What is its perimeter?

    5252
    • 7 cm
    • 10 cm
    • 14 cm

  5. A regular hexagon has 6 equal sides, and each side is 3 cm long. What is the perimeter?

    Answer: ______________

  6. A rectangle has a length of 12 cm and a width of 5 cm. Which calculation gives the correct perimeter?

    • 12 + 5
    • 12 x 5
    • 2 x (12 + 5)
    • 12 - 5

  7. Mia measures a rectangular table. The long sides are 120 cm and the short sides are 80 cm. What is the perimeter?

    1208012080
    • 200 cm
    • 320 cm
    • 400 cm

  8. A rectangle has a length of 15 m and a width of 7 m. What is the perimeter?

    Answer: ______________

  9. Sam says the perimeter of a rectangle with sides 8 cm and 3 cm is 8 + 3 = 11 cm. What mistake did Sam make?

    • He forgot to add all four sides, not just two
    • He should have multiplied instead of adding
    • He measured the wrong shape

  10. Priya wants to put a ribbon border around a rectangular photo. The photo is 12 cm wide and 18 cm tall. How many centimetres of ribbon does she need?

    12181218

    Answer: ______________

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Answer key

For grown-ups. Fold this page away before handing over the rest.

Measuring Perimeters W1-mt_wE7-Gs9ENL-s1

  1. True · Perimeter is a name for the distance you would travel if you walked once all the way around a shape.
  2. 18 · You add up the length of every side to get the total distance around the rectangle.
  3. 22 · You add the length and width, then double the result because a rectangle has two of each side.
  4. 14 cm · Add every side, not just two of them: 5 + 2 + 5 + 2 = 14 cm.
  5. 18 · For a regular shape, multiplying the side length by the number of sides is faster than adding one at a time.
  6. 2 x (12 + 5) · A rectangle has two lengths and two widths, so you add them once and then double the total.
  7. 400 cm · Add all four sides: 120 + 80 + 120 + 80 = 400 cm.
  8. 44 · Adding the length and width and doubling the total gives the perimeter of any rectangle.
  9. He forgot to add all four sides, not just two · A rectangle has 4 sides: two 8 cm sides and two 3 cm sides. Sam should add 8 + 3 + 8 + 3 = 22 cm.
  10. 60 · Add every side of the rectangle: 12 + 18 + 12 + 18 = 60 cm of ribbon.
Worksheet · LightMySky