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How many square slabs each with side 90 cm are needed to cover a floor of area 81 sq m?

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How many square slabs each with side 90 cm are needed to cover a floor of area 81 sq m?

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Area of the floor = 81 m2 = 81 × 10000 cm2 = 810000 cm2

Area of one square slab = (90 × 90) cm2 = 8100 cm2

The required number of square slabs 

= Area of the floor/ Area of a square slab

= 810000/8100 = 100

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