The floor of a storeroom is a rectangle 6 m long and 4.5 m wide. How many square tiles of side 30 cm are needed to cover it exactly?

Explanation

1. 01

   Work in centimetres: the floor is 600 cm × 450 cm = 2,70,000 cm².

2. 02

   One tile covers $30 \times 30 = 900$ cm².

3. 03

   Number of tiles = $2{,}70{,}000 \div 900 = 300$. (Check: 20 tiles along the length and 15 along the width, $20 \times 15 = 300$.)