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[[1]] square slabs each with side 90cm are needed to cover a floor of area 81sqm.

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Detailed Solution

100 square slabs each with side 90cm are needed to cover a floor of area 81sqm.
Given that side of each square = 90 cm and area of the floor =81sq.m.
Since 1sq.m = 10000 sq.cm. Then,
Area = 810000 sq.cm
Area of slab square = side

\times

side
= 90

\times

90
= 8100
∴ Area of square slab is 8100sq. cm
Number of square slabs required to cover the area of 81 sq. m
=

\frac{Area of floor}{Area of each slab}

\frac{810000}{8100}

= 100
Hence, 100 square slabs are required to cover 81 sq. m.

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