Rectangle area by multiplying · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Multiplying to find area

Mathematics · Measurement · ages 8-9
Name ______________________   Date ____________

  1. Work out 7 x 9.

    Answer: ______________

  2. A rectangle is 7 cm by 9 cm. What is its area?

    • 63 square cm
    • 16 square cm
    • 32 square cm
    • 79 square cm

  3. What is the area of a rectangle that is 4 cm by 5 cm?

    • 9 cm²
    • 18 cm²
    • 20 cm²

  4. To find the area of a rectangle, you can multiply the length by the width instead of counting every square.

    Circle one:   True   False

  5. A rectangle with area 36 has one side 4. How long is the other side?

    Answer: ______________

  6. Which pair of side lengths gives a rectangle with an area of 36 square units?

    • 4 units by 8 units
    • 6 units by 6 units
    • 5 units by 8 units

  7. A garden is 8 m by 5 m. What is its area?

    • 13 square metres
    • 40 square metres
    • 26 square metres
    • 45 square metres

  8. A gardener says an 8 m by 5 m garden covers 40 square metres because 8 x 5 = 40. Is the gardener right?

    Circle one:   True   False

  9. Zoe wants to draw a rectangle with an area of 36 square units. She draws one with sides 6 units by 5 units. What mistake did she make?

    • No mistake, 6 × 5 = 36
    • 6 × 5 = 30, not 36, so the area is wrong
    • She should have added 6 and 5

  10. A wall is 12 m by 3 m. What is its area in square metres?

    Answer: ______________

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Answer key

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

Multiplying to find area W1-mt_GzcJEVkNRn-s1

  1. 63 · 7 x 9 = 63.
  2. 63 square cm · 63 square cm is correct because 7 x 9 = 63. 16 adds, 32 walks the edge, and 79 miscalculates.
  3. 20 cm² · Multiply the side lengths: 4 × 5 = 20 cm².
  4. True · Multiplying the side lengths gives the same answer as counting, but much faster.
  5. 9 · The other side is 9 because 4 x 9 = 36.
  6. 6 units by 6 units · 6 × 6 = 36 square units. The other pairs multiply to 32 and 40.
  7. 40 square metres · 40 square metres is correct because 8 x 5 = 40. 13 adds, 26 perimeters, 45 miscalculates.
  8. True · The gardener is right because sides multiply into area with square units.
  9. 6 × 5 = 30, not 36, so the area is wrong · 6 × 5 = 30, so her rectangle's area is 30 square units, not 36. She needs sides that multiply to 36, like 6 × 6.
  10. 36 · 36 square metres because 12 x 3 = 36.
Worksheet · LightMySky