How many tiles of measure 10 cm x 10 cm are required to cover a surface of 4m x 2.5 m?

Area of the surface = 2.5 m × 4 m = 10 m= 10 × 10000 = 100000 cm2
area of each tile = 10 cm × 10 cm = 100 cm2
no. of tiles  = area of surfacearea of each tile = 100000100 = 1000area of surfacearea of each tile = 100000100 = 1000
 

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