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

^{2 }= 10 $\times $ 10000 = 100000 cm

^{2}

area of each tile = 10 cm $\times $ 10 cm = 100 cm

^{2}

no. of tiles = $\frac{areaofsurface}{areaofeachtile}=\frac{100000}{100}=1000$$\frac{areaofsurface}{areaofeachtile}=\frac{100000}{100}=1000$

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