Mental Maths Class 5 Mensuration

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

A rectangular sheet of paper (12 cm x 10 cm) has a square of side 3 cm cut out from one corner. What is the area of the remaining sheet?

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A 120 sq. cm
B 111 sq. cm
C 117 sq. cm
D 129 sq. cm

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Answer: B. 111 sq. cm

The correct answer is B. The original area of the sheet is 120 sq. cm (12 x 10). The area of the square removed is 9 sq. cm (3 x 3). Subtracting 9 from 120 leaves 111 sq. cm.

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A rectangular sheet of paper (12 cm x 10 cm) has a square of side 3 cm cut out from one corner. What is the area of the remaining sheet?

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