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Year 4 Area and Perimeter Worksheet — Level 3 — Practice Set 3 — Answers

Answer sheet with worked solutions for the Year 4 area & perimeter worksheet.

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Success TutoringWorksheetsAnswer sheetYear 4 · Mathematics · Area & Perimeter

Year 4 Area and Perimeter Worksheet — Level 3 — Practice Set 3 — Answers

Write the formula, substitute, then calculate. Include units.

1.A triangle has a base of 15 mm and a perpendicular height of 9 mm. Find its area.

Answer: 67.5 mm2

  1. A = ½ × base × height = ½ × 15 × 9
  2. = 67.5 mm2
2.An L-shape is made from a 17 cm by 11 cm rectangle joined to a 7 cm by 9 cm rectangle. Find the total area.

Answer: 250 cm2

  1. Rectangle 1: 17 × 11 = 187
  2. Rectangle 2: 7 × 9 = 63
  3. Total: 187 + 63 = 250 cm2
3.An L-shape is made from a 16 mm by 7 mm rectangle joined to a 9 mm by 10 mm rectangle. Find the total area.

Answer: 202 mm2

  1. Rectangle 1: 16 × 7 = 112
  2. Rectangle 2: 9 × 10 = 90
  3. Total: 112 + 90 = 202 mm2
4.A triangle has a base of 15 mm and a perpendicular height of 10 mm. Find its area.

Answer: 75 mm2

  1. A = ½ × base × height = ½ × 15 × 10
  2. = 75 mm2
5.A triangle has a base of 8 cm and a perpendicular height of 15 cm. Find its area.

Answer: 60 cm2

  1. A = ½ × base × height = ½ × 8 × 15
  2. = 60 cm2
6.A rectangle is 10 mm long and 14 mm wide. Find its area.

Answer: 140 mm2

  1. A = length × width = 10 × 14
  2. = 140 mm2
7.A triangle has a base of 13 cm and a perpendicular height of 5 cm. Find its area.

Answer: 32.5 cm2

  1. A = ½ × base × height = ½ × 13 × 5
  2. = 32.5 cm2
8.A triangle has a base of 9 mm and a perpendicular height of 3 mm. Find its area.

Answer: 13.5 mm2

  1. A = ½ × base × height = ½ × 9 × 3
  2. = 13.5 mm2
9.An L-shape is made from a 28 cm by 4 cm rectangle joined to a 11 cm by 2 cm rectangle. Find the total area.

Answer: 134 cm2

  1. Rectangle 1: 28 × 4 = 112
  2. Rectangle 2: 11 × 2 = 22
  3. Total: 112 + 22 = 134 cm2
10.A triangle has a base of 20 cm and a perpendicular height of 8 cm. Find its area.

Answer: 80 cm2

  1. A = ½ × base × height = ½ × 20 × 8
  2. = 80 cm2
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