CBSE Class 5 Mathematics Area And Its Boundary Worksheet Set 03

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Question a). The area of a square of side 12 cm will be
(a) 32 cm square
(b) 144 cm square
(c) 350 cm square
Answer: (b) 144 cm square
Side of the square = 12 cm
Area of a square = \(\text{side} \times \text{side}\)
Area = \(12\text{ cm} \times 12\text{ cm} = 144\text{ cm}^2\) (or 144 cm square)
In simple words: Multiply the side length by itself to find the area of a square.

Exam Tip: Always remember that area is expressed in square units (like cm square or \(\text{cm}^2\)).

Question b). A rectangular plot is 20cm by 15 cm its area will be
(a) 300 cm square
(b) 300 cm
(c) 300 m
Answer: (a) 300 cm square
Length of the rectangle = 20 cm
Breadth of the rectangle = 15 cm
Area of a rectangle = \(\text{length} \times \text{breadth}\)
Area = \(20\text{ cm} \times 15\text{ cm} = 300\text{ cm}^2\) (or 300 cm square)
In simple words: Multiply the length and breadth of the rectangle to get the area.

Exam Tip: Do not confuse area units with perimeter units; area always uses square units.

Question c). The perimeter of a square whose sides are 6.4cm will be
(a) 25.6 cm
(b) 2.56 cm
(c) 12.8 cm
Answer: (a) 25.6 cm
Side of the square = 6.4 cm
Perimeter of a square = \(4 \times \text{side}\)
Perimeter = \(4 \times 6.4\text{ cm} = 25.6\text{ cm}\)
In simple words: Add all four sides or multiply the side length by 4 to find the perimeter.

Exam Tip: Perimeter is the total boundary length, so it uses linear units (like cm), not square units.

Question d). The perimeter of a square whose sides are 10.5cm will be
(a) 42 cm square
(b) 42 cm
(c) 4.2 cm square
Answer: (b) 42 cm
Side of the square = 10.5 cm
Perimeter of a square = \(4 \times \text{side}\)
Perimeter = \(4 \times 10.5\text{ cm} = 42\text{ cm}\)
In simple words: Multiply 10.5 by 4 to find the total distance around the square.

Exam Tip: Be careful to select the option with linear units (cm) and not square units (\(\text{cm}^2\)) when calculating perimeter.