Question

A room $20$ cm long and $10$ cm broad is to be paved with square tiles. Find the least number of square tiles required to cover the floor.

Answer 1

Length of room $=20$cm

Breadth of room $=10$cm

The HCF of $20cm$ and $10cm$ will be size of square tiles HCF of $20$ and $10=10cm$

Area of room = $20\times 10=200{cm}^2$

Area of 1 tile = $10\times 10=100{cm}^2$

Number of tiles = $\frac{200}{100}=2$