Math topics

Area and perimeter

Perimeter adds the side lengths around a shape. For a rectangle, perimeter = 2 × (length + width). Area counts square units inside; for a rectangle, area = length × width. Keep units clear.

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Worked example

Problem. What is the perimeter of a rectangle with length 11 and width 8?

1. Perimeter = 2 × (length + width).
2. 11 + 8 = 19.
3. 2 × 19 = 38 units.

Answer. 38

Practice set

1. Practice 1. Perimeter of a 5-by-3 rectangle?

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   16

2. Practice 2. Area of a 5-by-3 rectangle?

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   15

3. Practice 3. Perimeter of a square with side 6?

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   24

Related pages

• Multiplication practice
• Math for grades 3–5
• Math for grades 6–8

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